Categories
Museum Closure in the UK

Trains, planes, and automobiles – how much do we know about where collections go?


The Mapping Museums Lab have been collecting data on over 450 closed museums, including what happens to their collections and buildings. As we gather information about collections, we’re learning that the data available varies widely from one museum to another. In some cases we’ve obtained a list of where every exhibit went, with the type of destination (such as a museum or private storage facility), and sometimes the state of repair of individual objects. In other cases, we have gathered little more than that the collection was sold, often at auction, and dispersed into private hands.

We’re in the relatively early stages of a two-year project, but some patterns are already starting to emerge. For instance, legal processes can have the effect of producing better public documentation for collection dispersals. Liquidators managing company insolvencies produce annual reports, which detail the disposal of assets, and a set of those reports were produced when the parent charity of the Yorkshire Waterways Museum went into liquidation. A more controversial example is the British Empire and Commonwealth Museum, where accusations of impropriety led to numerous news reports that documented the complex trajectories of some of the exhibits. Although Bristol Museums now look after the bulk of the collection, the whereabouts of some items formerly held by the BECM are still unknown.

The type of object displayed can make a big difference to the amount of information available. Museums of aviation and railways, which in the cases we’re looking at often display a fairly small number of large objects, are particularly well documented. One example is the Electric Railway Museum, which was a collection of locomotives, electric multiple units and related items, sited near Coventry. The museum’s founder kindly supplied us with a detailed list of the whereabouts of the collection, and the ownership status of each object.

Multiple electric locomotives and rolling stock. A shed is visible on the right hand side.
The Electric Railway Museum in 2012. Photo: Fairfaithfull on Wikimedia Commons

The collections of closed aviation museums can also be fairly straightforward to track. Each plane, in addition to having a manufacturer and model, also has a unique identification number that enables its whereabouts to be found. I have never needed to visit the Demobbed website before starting this project, but that database of former military aircraft has proved invaluable in tracking down some of the planes that were held by now-closed museums. Demobbed features extensive lists of aircraft locations maintained by the Wolverhampton Aviation Group, who are evidently a dedicated community of enthusiasts. Each plane’s history is detailed, including whether parts of it, such as nose cones, were removed and dispersed.

Museums featuring ships and boats have also been relatively easy to track. The small collection of five ships and submarines once held by the Warship Preservation Trust in Birkenhead has been exhaustively documented. This is partly due to a museum and a heritage organisation acquiring two of the vessels. But thanks to enthusiasts keeping an eye on the others, documenting them online and sometimes campaigning for their preservation, we know that a submarine and the frigate HMS Plymouth were scrapped, while the last known destination of the minesweeper HMS Bronington was a dock in Birkenhead, where it had partially sunk at its moorings.

But for another maritime collection there is more uncertainty about destinations. The large collection of boats at the Eyemouth Maritime Centre was sold at auction in 2017. The sale attracted a fair amount of attention from boating enthusiasts, which means that we have been able to track the destinations of quite a few of the boats. However, around 100 boats were reportedly purchased by a collector and cut up to enable transportation to China. This shipment was apparently intended for a new maritime museum but we don’t know whether it ever opened, leaving the whereabouts of a substantial part of the Eyemouth collection unknown.

Warships and a U-boat moored in Birkenhead Dock.
Warships Preservation Trust. Photo: Chowells on WikiMedia Commons.

Although planes, trains, and ships have been easy enough to track down in many cases, car and motorcycle museums are another matter. So far, we’ve found that many of these collections go to auction and are subsequently dispersed to private buyers. Occasionally it’s possible to discover that some items have gone to museums, but not always which ones. The auctioneers of the London Motorcycle Museum told us that three of the bikes had been purchased by museums, but our enquiries have not revealed precisely where they went. The case of the Cars of the Stars museum, mentioned in a previous blog, where the collection went to just one buyer who also runs a museum, appears to be quite unusual. As the destinations of auctioned items are rarely reported, that type of museum dispersal is often the end of the trail for us.

A tug painted in bright blue and yellow moored at the dockside.
Wheldale at Yorkshire Waterways Museum in 2005. Photo by George Robinson on WikiMedia Commons.

As our research continues, it’s becoming apparent that although some collections are very well documented, sometimes down to the level of individual items, in many cases we are simply recording groups of items as moving from a closed museum. And it’s unfortunately quite likely that we will never know what has happened to many others, with the destinations of items and even whole collections left unrecorded. Those differences in what we can find out have implications for how we analyse our data. We don’t want to over-represent some collections in our analyses simply because we have more details about them, or under-represent others that are less well documented. As a team we’re continuing to discuss how best to grapple with that problem.

Mark Liebenrood

Categories
Museum Closure in the UK

Museum closures and deprivation

Are museums more likely to close in areas of higher deprivation? It seems an obvious question. The more deprived an area is, the less capacity the council has for raising revenue from business rates and council tax, and the more likely it is to have to cut non-statutory services, such as museums. Meanwhile independent museums in deprived areas might struggle due to the lack of disposable income. Except that turns out not to be the case.

In the last blog we considered closure according to region, which provided us with an overview of museum geography in the UK. In this blog we take a more granular approach and draw on the Index of Multiple Deprivation. This is the official measure of relative deprivation in the UK and is assessed on a combination of household income, employment, education, health, crime, barriers to housing and services, and living environment. Using the index allows us to look at deprivation in relation to small areas with around 1,500 residents apiece, which then enables a more nuanced understanding of where museums are located and the types of places where closure occurs. Deprivation is calculated differently in Northern Ireland, Scotland, and Wales, making comparisons difficult, so in this blog we focus only on England.

Table 1 shows the distribution of open museums across England as of the beginning of 2024. They have been classified according to governance and the deprivation of the ward in which they are located. As you can see, all kinds of museums can be found in almost all areas – irrespective of deprivation. There are no national museums in the least deprived areas and no university museums in the most deprived, although both these types of museums have relatively small numbers. Most notably, private, and independent (not for profit) museums cluster in the middle ground, while local authority museums tend towards the most deprived.

Table 2 shows change in the number of museums since 2000 and gives the percentage change in each category. As we outlined in our previous blog the number of independent (not for profit) and private museums rose since 2000. Here we can see that the expansion in numbers of not-for-profit and private museum goes across the spectrum of deprivation with large growth in the middle.

The number of Local Authority museums has decreased since 2000 but there has been less decrease in the middle ground. There has been a greater decrease in the number of Local Authority museums at the edges of the spectrum, that is in areas of most and least deprivation.

There are two important caveats to this data. Firstly, the Index of Multiple Deprivation does not equate to average affluence or poverty. Rather it looks at most and least deprived, which is slightly different. So for instance, one area may contain pockets of extreme wealth and considerable deprivation, whereas another may be less affluent but also have little deprivation in the sense that residents are all in employment, there are low rates of crime, and so on. According to the Index the first area is more deprived – there is some deprivation amid the wealth – while the second is less deprived.

The second caveat is that a museum’s location is not synonymous to the visitor catchment area. These small areas represent the immediate geographic context in which a museum is sited and visitors may come from much further afield. The degree to which they do so depends in part on the type of museum in question; whether it is a national, regional, or small local museum. Going forward we will be thinking further about calculating the distribution of museums and change according to the visitor catchment area.

Yet despite the caveats, the data shows that change in the sector does not neatly align with levels of deprivation. We cannot link museum closure to deprivation or indeed growth in numbers to a lack of deprivation.

Fiona Candlin
George Wright
Andrea Ballatore

Photo: Katy Pettit

Categories
Museum Closure in the UK

New data on UK Museum Closure 2000–2024: Governance and region

At least 467 museums have closed in the UK since the beginning of the millennium.1 For organisations that aim at keeping their collections for posterity that figure may seem high, but it is important to realise that for most of the past twenty-four years, more museums have opened than closed. The sector is still bigger now than it was in 2000. The more pertinent question is which types of museums have closed and where? Are parts of the sector thriving while others struggle? When did they close: are we on an upwards or downwards trajectory or is the sector flatlining? Over the next few months, we’ll address all these questions. In this blog we’ll concentrate on governance, looking at the differences between governance types, and if those are nuanced with respect to region.

Table 1 shows that around 138 independent (not for profit) and 152 private museums definitely closed during the period under study. Those numbers are far outweighed by openings. Since 2000 some 418 independent (not for profit) and 209 private museums have opened, which more than offsets the numbers of closures. There are far fewer university and national museums, but like not-for-profit and private museums, their overall numbers have also risen. Twelve university museums have closed and eighteen opened, and three national museums or additional branches have closed with eleven openings. In terms of overall numbers at least, the private and independent (not for profit) museum sectors have collectively managed to ride out waves of austerity, the pandemic, and the cost-of-living crisis. The same is not true of local authority museums, 145 of which have closed with only 72 opening, a loss of 73 museums.

It is easier to grasp what is happening in the museum sector if we frame openings and closures in terms of percentage change. That approach takes the numbers of closures and openings for each group of museums into account and judges them against the total number of museums in that category. Looking at Table 1 we can see that the overall number of independent (not for profit) museums has risen by a substantial 22%, private and national museums by around 13%, and university museums by 7%. In stark contrast, the change for local authority museums is -9%.

So where exactly are these museums opening and closing? Table 2 shows us that growth among independent (not-for-profit) museums, has been spread across all the nations and English regions regions most notably Wales, Scotland, and the East of England. Conversely, the number of Local Authority museums has decreased in all regions, the exception being Northern Ireland (where the museum sector has consistently had different patterns of growth and closure to the rest of the UK). The dropping numbers of Local Authority museums is the most worrying aspect of museum closure over the last twenty-four years. Scotland lost by far the most local authority museums, with a drop of seventeen since 2000, that is, 12% of its total. However the situation is perhaps more troubling in London which lost nine local authority museums, a decrease of 22%, the largest in the UK. Although the capital is well served by national museums, they are mainly located in the centre of the city and serve a national and international audience, whereas the Local Authority museums are mainly in the outer boroughs and are usually conceived as a service for the neighbourhood.

We also want to point to the areas that have low growth among independent museums and have simultaneously lost a higher proportion of Local Authority museums – particularly the North West. In these areas, the overall levels of museum provision, and hence the benefits that they may provide in terms of access to public space, informal education, culture, and just pleasure, are being correspondingly reduced.

In our next blog we will be looking at social deprivation and exploring the issue of closure and access to museums in more detail. Please subscribe to receive further posts on our work in progress and new findings.

Fiona Candlin and George Wright

  1. A note on numbers:
    In most cases, we have a definite year for museum closure. In some cases, we have a date range. For example, we may know that a museum closed at some point between 1995 and 2005 but cannot determine exactly when. In these instances, we calculate the probability of it having closed after 2000 and factor that information into the analysis. That can lead to some slight discrepancies in the totals, for instance when one number is rounded down and another rounded up. Apart from the headline number of 467 definite closures since 2000, all the data reported in this post are based on probabilistic estimates. Our best estimate of the total number of closures is 534. ↩︎
Categories
Lab News Publications

Mapping Museums data used by ONS

The Office for National Statistics (ONS) used Mapping Museums data in a new analysis of public access to sports facilities, supermarkets and museums.

Of museums, they write:

Urban areas, in particular large cities, have fewer museums relative to their population than rural areas. Seven of the ten local authorities with the fewest museums per 100,000 people in the UK are London boroughs. Those local authorities with the higher proportion of museums tend to have small not-for-profit local history museums.

https://www.ons.gov.uk/peoplepopulationandcommunity/wellbeing/articles/moreadultsareactiveinareaswithahighernumberofsportsfacilities/2024-03-07

The new release includes a report and four datasets, including the number of museums across Local Authority Districts (LAD) in the United Kingdom.

Categories
Lab News

Funding success for the Mapping Museums team

We are pleased to announce that the Arts and Humanities Research Council has awarded £1million to the Mapping Museums research team for their project ‘Museum Closure in the UK 2000-2025’.  

The new research will use trans-disciplinary methods to analyse closure and collections dispersal within the UK museums sector. Its aim is to examine the geographic distribution of closure, to better understand types of closure (e.g., whether museums are mothballed or disbanded), and to document the flows of objects and knowledge from museums in the aftermath of closure. We will investigate the afterlife of collections, find out if museum exhibits are scrapped, sold, stored, or re-used, and examine ‘outreach’ and temporary museums. A Knowledge Base will be designed to model and store the collected data, and visualisations and analyses of the data will be developed. Above all, we aim at critically reassessing notions of permanence and loss within the museums sector.  

‘Museum Closure’ is based at Birkbeck, University of London and at King’s College London, and will run for two years, beginning in October 2023. It is led by Fiona Candlin, Professor of Museology, who will be working with co-investigators, Dr Andrea Ballatore (King’s College London), a specialist in cultural data science, Alexandra Poulovassilis, Emeritus Professor in Computer Science, and Peter Wood, Professor in Computer Science. The post-doctoral researcher is Dr Mark Liebenrood (museum history) and we will be recruiting a second post-doctoral researcher in data science.

(Image modified from original, by elston on Flickr)

Categories
Research Process

A week in the life

What does the Mapping Museums research assistant do all day? I sometimes wonder where all the time goes. Although the vast majority of the four thousand-odd museums listed in the database were added before I really began work on the project, I’ve added well over a hundred new museums and made corrections to the entries for hundreds more. But how do we find out about museums that were not already in the database, and where do all the amendments come from? Here I offer a peek into a ‘typical’ week.

Monday

A friend of the project reports on Twitter a possible new museum she’s spotted while on a bike ride. It turns out that it is not new, but the small private museum has slipped under the Mapping Museums radar, so I add it to the database. Another contact has suggested we check a directory of railway preservation sites to make sure we haven’t missed any railway museums during our searches. I order it from the British Library for my next visit.

Tuesday

I have Google news alerts set up in the hope of spotting museums closing and opening, and I open my email this morning to find an alert for a new museum. All too often these alerts don’t produce anything useful, but on this occasion they have. A new private museum dedicated to the footballer Duncan Edwards has opened above a shop in Dudley, in the West Midlands, so I make a note to add it to the database.

The Mapping Museums database is constantly being updated. When we receive new information for museums currently open, we update our records accordingly. Today I find that a curator has supplied updated details for their museum using the form for editing data, and process the update so that the details are added to the database.

Wednesday

At the British Library for my own PhD research, I also look at the railway preservation directory. At first sight it looks somewhat daunting, as it lists hundreds of railway preservation sites in Britain opened from the 1950s onwards, classified into thirteen types. Each one of these will potentially need to be checked against the database to see whether museums need to be added. I copy the pages I need for processing later.

Looking through copies of Museums Journal I see mention of another museum that I’m not familiar with. It’s in the database, but the news item gives extra information about the museum’s governance that we didn’t have, so I make a note for later.

Sometimes we need to contact museums directly to confirm information, and recently I have been trying to get hold of the administrator of a small military museum in Scotland (the museum came to our attention as part of a list supplied by a liaison officer for regimental museums). The administrator is only on site occasionally, and so far I have missed him each time I’ve called. I miss a call while sitting in the library’s reading room, and when I return it later I have just missed him, but his colleague supplies his email address. By email he confirms the nature of the collection, but does not know when the museum was first opened – he has been in the post for less than two years. One thing I’ve discovered doing this research is that it is quite common for the opening date of museum not to be known by those who run it. A museum’s foundation date is often tacit knowledge, which can easily be lost as staff change. The database currently contains almost five hundred museums for which we do not have a certain opening date, and we record them as date ranges instead based on the best information available.

Thursday

I resume work on a list of museums that another contact has provided us with. They are all in North East England. Not all of them qualify as museums in the way that the project defines them but many do, and for whatever reason some have been overlooked. Small private museums are easily missed, and it would not be possible for the project to have compiled as comprehensive a list as it has without the benefit of local knowledge. One example is the Ferryman’s Hut Museum in Alnmouth, which I add to the database.

Friday

The opening date of a museum is proving elusive. My enquiry to the owners remains unanswered, so I resume searching online. Eventually I track it down in the Gloucestershire volumes of the Victoria County History, an incredibly valuable local history resource.

It’s fortunate that that museum was recorded, but what do you do when a museum has long closed and there are no references to be found online, no matter how hard you search? Well, you might descend the archive.org rabbit hole. As anyone who has followed references in Wikipedia may have noticed, website links stop working all the time – a phenomenon colloquially known as ‘link rot’. The Wayback Machine preserves websites for posterity, keeping copies of those still online as well as many that have long since vanished. In this case we knew that the museum had closed thanks to an estate agent’s website, but when did it open? The website for the tower in the Scottish Borders had fortunately been captured by the wayback machine, and while there was no definitive information about the museum, there was enough to allow a range of dates for the museum’s opening to be recorded.

It’s the end of another week of data collection and checking. That list of hundreds of railway preservation sites will have to wait until another time …

Mark Liebenrood

Categories
Lab News Publications

The Mapping Museums Website and Database is Now Live

Well it’s not the launch we’d hoped for. We were supposed to mark the event with a panel discussion and wine reception at London Transport Museum, and for weeks I’ve been looking forwards to hearing what the speakers had to say about our report. I’ve been borderline worried about the possibility that we might have overlooked something important or that there would be an error in the database that had hitherto gone unnoticed, and I’ve imagined us all afterwards, happily drinking wine at the reception, toasting each other for our success. We had 120 delegates booked in, coming from all kinds of interesting places, and a long waiting list. I’d even bought a new outfit. Sigh. It is disappointing but given the current spread of Covid-19, it was better to err on the side of caution and to postpone the event.

On the up side, we have decided to go ahead and publish. So, if you have had to self-isolate and need some alternatives to Netflix, then there is a cornucopia of museum information just waiting for you.

www.mappingmuseums.org

The website has links to podcasts and lectures, to a series of academic articles, and to transcripts of dozens of interviews with the founders of museums. It’s got sections on how we collected the data and built the database, on our definitions of museums and our new subject classification system. Above all, there is the database: information on 4,200 museums that have been open at some point between 1960 and 2020. If you’ve always wanted to know where to find museums of food and drink, or how many railway museums there are in the UK, then the answer is now at your fingertips.

We have also published ‘Mapping Museums 1960-2020: a report on the data’, which provides a summary of the research and of our methods, and a guide to the findings from the data. This is where you’ll find information on the numbers of museums that have opened in the UK over the last six decades, when they opened, the subjects they covered, their governance, where they were, and if they closed. The report can be accessed through the Publications page.

I do hope that you will enjoy the website, and find the report and database useful. If you have any feedback on the project, and especially on how you’re using the information, then do please let us know.

Fiona Candlin

Image: First Flight of Space Shuttle Endeavour Launches — May 7, 1992, by NASA under Creative Commons licence

Categories
Publications

New publications

Mapping Museums articles are like buses. You wait patiently for ages, and then three come along at once. We’ve provided the abstracts here and any interested readers can click on the links below for a full text copy.

Understanding and Managing Patchy Data in the UK Museum Sector

Fiona Candlin and Alexandra Poulovassilis

It is well accepted that the museum sector has a longstanding problem with data collection and management. This article begins by exploring problems with gaining access to data, poor archiving and coverage, and the absence of data. We then explain how the Mapping Museums research team set out to remedy the lack of longitudinal data on the UK museum sector in the period between 1960 and 2020. Initially we collated and supplemented existing information on UK museums but it was impossible to fill some gaps or resolve some inconsistencies in the data. Here we discuss how we designed a database that was sensitive to the patchiness of the material, and that could model uncertain and absent data in computational terms. To close, we briefly comment on how our data enables research on museum history and on how the problems with data collection in the sector might be remedied in the longer term.

https://www.tandfonline.com/eprint/8BXPW7CUQ3IMXXQGS7D7/full?target=10.1080/09647775.2019.1666421

The Missing Museums: Accreditation, surveys, and an alternative account of the UK museum sector

Fiona Candlin, Jamie Larkin, Andrea Ballatore, and Alexandra Poulovassilis

Surveys of the UK museum sector all have subtly different remits and so represent the sector in a variety of ways. Since the 1980s, surveys have almost invariably focused on accredited institutions, thereby omitting half of the museums in the UK. In this article we examine how data collection became tied to the accreditation scheme and its effects on how the museum sector is represented as a professionalised sphere. While is important to understand the role of surveys in constructing the museum sector, this article also demonstrates how the inclusion of unaccredited museums drastically changes the profile of the museum sector. We outline the inclusive research methodology of the Mapping Museums project team and compare our findings with those produced when a survey is limited to accredited museums. In so doing, we sketch out an alternative, heterogeneous version of the UK museum sector and make recommendations based on that evidence.

https://www.tandfonline.com/eprint/CRDWGTPUIC2FQFYXYWYT/full?target=10.1080/09548963.2019.1690392

Creating a Knowledge Base to Research the History of UK Museums through Rapid Application Development

Alexandra Poulovassilis, Nick Larsson, Fiona Candlin, Jamie Larkin, and Andrea Ballatore

Several studies have highlighted the absence of an integrated comprehensive dataset covering all of the UK’s museums, hence impeding research into the emergence, evolution, and wider impact of the UK’s museums sector. “Mapping Museums” is an interdisciplinary project aiming to develop a comprehensive database of UK museums in existence since 1960, and to use this to undertake an evidence-based analysis of the development of the UK’s museum sector during 1960–2020 and the links to wider cultural, social, and political concerns. A major part of the project has been the iterative, participatory design of a new RDF/S Knowledge Base to store data and metadata relating to the UK’s museums, and a Web Application for the project’s humanities scholars to browse, search, and visualise the data to investigate their research questions. This article presents the challenges we faced in developing the Knowledge Base and Web Application, our methodology and methods, the design and implementation of the system, and the design, outcomes, and implications of a user trial undertaken with a group of experts from the UK’s museums sector.

https://dl.acm.org/doi/pdf/10.1145/3343871?download=true

Categories
Lab News

Two Years On: An Update

The Mapping Museums project is coming to the end of its second year. To mark the half way point of the research, this blog provides a brief update on some of the work so far.

Finalising the data
Early this year, Dr Jamie Larkin, the researcher, completed the main phase of data collection. We are continuing to make changes to the dataset as new museums open and existing museums close, and we’re still trying to hunt down some missing opening and closing dates, so it remains work in progress. Nonetheless, we now have information on almost 4,000 museums that have been open at some point between 1960 and the present day.

Evaluating the knowledge base

Alongside data gathering, we have designed a knowledge base that allows users to browse, search, and visualise the data in nuanced and precise ways, and which we described in our last blog (See: Managing Patchy Data). As part of the design process, Professor Alex Poulovassilis, the co-investigator on the project, and Nick Larsson, the Computer Science researcher and developer of the knowledge base, organised a series of trials to evaluate the knowledge base. These provided us with valuable feedback and we responded by making changes to how the material is presented and navigated.

We got enormously positive responses at the most recent user trial in Manchester in July. Having lived and breathed the research for the last two years it was very encouraging to hear Emma Chaplin, director of the Association for Independent Museums, call it the “museums equivalent to YouTube” and say that she could while away hours browsing the material; to know that staff from Arts Council England thought that it was “intuitive  to use”; and generally that the trial participants assessed it as a being a useful resource for them in their roles and for others in the sector.

Analysing and publishing the findings

Having finished the data collection and the main phase of developing the knowledge base, we have been able to start analysing the data. These initial analyses will be the basis of a series of articles, and over the summer, the team has been working on four publications:

  • ‘Mapping Museums and managing patchy data’ examines the reasons why data on the museum sector is so incoherent, how the project sought to remedy that situation, in part by building a system that acknowledges uncertain information.
  • ‘Where was the Museum Boom?’ looks at the massive expansion of museums in the late twentieth century and asks whether or not the boom took place across the UK, or if there were regional variations.
  • ‘Creating a Knowledge Base to research the history of UK independent museums: a Rapid Prototyping approach’, covers the computer science research that underpins the conceptualisation and construction of the knowledge base.
  • ‘Missing Museums’ deals with the recent history of museum surveys, considers the focus on professionalised museums, and asks what the sector looks like when we factor in unaccredited museums.

Brief versions of the first and second of these papers were also presented at conferences: Digital Humanities Congress at Sheffield University and Spatial Humanities at Lancaster University, both of which took place in September, and we hope that the full versions of all four articles will be published within the next academic year. We’ll let you know when that happens.

The process of analysing data has been greatly helped by having Dr Andrea Ballatore join the team early in 2018. Andrea is a Lecturer in GIS and Big Data Analytics in the Department of Geography at Birkbeck and he is leading the statistical analysis within the project. He has also made invaluable contribution to developing the knowledge base, particularly with respect to mapping the data.

The Mapping Museums Team

Categories
Research Process

Modelling Patchy Data

How do researchers manage when they have missing data? One of the initial aims of the Mapping Museums project was to establish an authoritative dataset of all the museums open between 1960 and 2020, and to record information on their location, governance, accreditation status, subject matter, opening and closing dates, and visitor numbers. Having this material would provide the first step in constructing a nuanced, evidence-based history of the development of the museum sector during the period, and so the research team began to compile information from numerous sources: surveys conducted by government bodies, by the Association of Independent Museums, and the Museums Association; lists of museums held by the national organisations for the arts; guidebooks; and websites. The researchers also got in touch with dozens of tourist boards and local history groups, and hundreds of curators and volunteers to follow up leads or information. All this material was cross-checked within the team, and then reviewed by experts from the Museum Development Network.

We now have a rigorously researched list of museums in the UK from 1960-2020. Even so, there is still a considerable amount of missing data. When the first phase of data collection was finished we had identified almost 4,000 museums and had established the following coverage of their key attributes:

  • Museum opening dates: 88%
  • Museum closing dates: 6%
  • Governance: 92%
  • Visitor numbers: 67%

The question then was, how were we to represent and model the missing dates, governance, and visitor numbers within our analysis?

At the same time as collecting data, we started to build a knowledge base that allows users to explore. The system is designed so that users can browse in a structured way through the categories of accreditation, governance, location, size, subject classification, year of opening and year of closing, and see the results on a map or in a list view. Alternatively, they can submit a detailed search that allows them to filter results by combinations of the categories above, or they can generate visualisations of how the different types of museums have emerged over time and create tables showing how the various categories inter-relate. At any point, it is possible to scrutinise the details of individual venues.

One option for dealing with missing information was to exclude museums with missing data from the relevant searches. The problem with that approach is that incomplete data tends to be associated with small, unaccredited museums or with museums that have since closed and so excluding them on this basis would bias our analysis in favour of extant established museums., which would be counter to the purposes of the project as a whole. Thus, when we could not identify a museum’s governance, we assigned it a value of Unknown. The advantage of an explicit Unknown category is that the missing data is made apparent, and the problem of data patchiness is exposed rather than hidden.

We took a different approach to opening and closing dates because we often had rough information about these rather than no information at all – for example, we might know that a museum had closed at some point in the 1990s. This approximate information would be lost if we just categorised a date as ‘unknown’. Therefore, we decided to use a date range of the form (earliest possible year, latest possible year) to capture imprecise knowledge about museum opening/closing dates. These date ranges are used in different ways across the different facilities provided by our system:

  • In the Browse facility, we take museums’ opening/closing dates to be the mid point of the specified date range.
  • In the Visualise facility, event occurrences are ‘spread’ equally over a date range. For example, if a museum is known to have opened between 1965 and 1969, then the count of one museum opening is spread over that time period (i.e. a count of 0.2 is assigned to each of the five years 1965, 1966, 1967, 1968, 1969).
  • In the Search facility, the user has the option of searching by definite dates so that the results exclude all the museums with date ranges attached, or by possible dates, in which case the results include museums where the date range intersects with the specified period. This allows for a much more nuanced analysis.

Looking in more detail at how Search works, opening and closing dates are stored as a pair of years (f,t) in our database, where f and t may be the same year if we know the year of opening/closing for certain.  So, for example, the pair (1965,1969) would be stored for a museum known to have opened between 1965 and 1969; and the pair (2011,2011) would be stored for a museum known to have closed in 2011. Modal Logic operators are supported by our system’s Search facility that allow the user to query whether a particular museum definitely or possibly opened/closed in a given year.  In particular, suppose a given museum ‘m’ is recorded as having opened in year ‘f’ at the earliest and year ‘t’ at the latest.  Suppose a researcher wishes to find out whether museum m opened before, on, or after a specified year ‘d’.  Then the following comparison operators are supported by our system to allow the researcher to determine whether this is definitely the case:

Comparison operator Implementation logic
(f,t) = d  DEFINITELY ON A SPECIFIC YEAR f = d  and t = d
(f,t) < d  DEFINITELY BEFORE t < d
(f,t) <= d DEFINITELY BEFORE OR INCLUDING t <= d
(f,t) > d  DEFINITELY AFTER f > d
(f,t) >= d DEFINITELY AFTER OR INCLUDING f >= d
(f,t) != d DEFINITELY APART FROM t < d OR f > d

 

And the following comparison operators are supported to allow the researcher to determine whether this is possibly the case:

 

Comparison operator Implementation logic
(f,t) = d POSSIBLY ON A SPECIFIC YEAR f <= d AND d <= t
(f,t) < d  POSSIBLY BEFORE f < d
(f,t) <= d POSSIBLY BEFORE OR INCLUDING f <= d
(f,t) > d POSSIBLY AFTER t > d
(f,t) >= d POSSIBLY AFTER OR INCLUDING t >= d
(f,t) != d POSSIBLY APART FROM not (f=d and t=d)

 

The same comparison operators are available for interrogating closing dates.

We employed a further strategy for visitor numbers, which is the least complete category and has discontinuities that make it difficult to compare like with like.  Our primary objective was to use visitor number data to provide an indication of the size of the museum and, given the patchiness of the information, we decided to have a category of Unknown and also to gross numbers into size categories of Large, Medium and Small, where large and small also have sub-categories. This approach enabled us to include data from the Association of Independent Museums and Arts Council England who generally provide visitor number ranges rather than precise figures, and to use predicative analysis to establish broad size ranges. It also allowed us to circumvent some of the methodological problems of having figures collected by different means and from across the decades. Users can browse or search according to these size categories, and in addition, they can search according to precise date-stamped visitor numbers where available.

In conclusion, in the Mapping Museums project we have managed data patchiness in a variety of ways: designing a flexible knowledge base that can be modified and added to as required; representing absence rather than ignoring unknown information; using date ranges and providing users with the option of searching by definite or possible dates; and apportioning the probability of an opening/closing event occurrence over the estimated time interval for statistical analysis. Rather than implying that all visitor numbers data are of equal reliability, we created size categories for a large number of museums, and provided the means to search the definite but incomplete data that was available.

Fiona Candlin, Alex Poulovassilis
September 2018