Kenedict Innovation Analytics

A Peek Inside the Dutch Government’s Supplier Networks: Open Data Visualized

An excerpt of the supplier network of all 11 Ministries of the Dutch government

An excerpt of the supplier network of all 11 Ministries of the Dutch government (click to enlarge)

The Dutch government recently released its 2014 spend data to the public as part of an initiative to further increase the availability of Open Data. The datasets provide further information on the suppliers which each Ministry dealt with per purchase category, allowing visual deep dives into the inner workings of the government’s supplier networks. What does each Ministry’s supplier base look like? Network analytics provides an answer.

Written by André Vermeij, Kenedict Innovation Analytics

Update: Interactive visuals showing the supplier networks of all Ministries have been added. All suppliers with a related spend of over 10.000 euros are included. The larger a node, the more spend is associated with it. Colors reflect clusters of suppliers and categories based on proximity in the network (full screen version here):

Open Data is a hot topic in the Netherlands these days. The Dutch Minister of the Interior and Kingdom Relations, Ronald Plasterk, aims to stimulate the re-use of open government data by businesses and individuals to further enhance the societal impact of these data sources. As part of this initiative, the Dutch government’s Open Data portal ( was recently updated with a wide variety of datasets – including overviews of expenditures and related suppliers per Ministry and purchase category. According to a statement released when the data was made public, all spend datasets combined cover about 10 billion euros of expenditures across tens of thousands of suppliers.

The datasets do not provide exact spend figures – instead, expenditures are listed as 13 relatively broad ranges. The smallest range covers anything between 0 and 10.000 euros, while the largest range holds all expenditures larger than 150 million euros. Also, not all expenditures are included in the datasets. External time hire (interim managers, consultants, etc.) is not included, and neither is any data which breaks the privacy or confidentiality of specific suppliers.

Despite these limitations, the data is still quite rich, aggregating to over 66,000 records of suppliers, purchase categories and expenditure ranges ready for further analysis. The data is also quite ‘clean’: supplier names are matched with the Dutch Chamber of Commerce’s databases, and company subsidiaries are merged with their parent companies already. In the end, this drills down to 31,567 unique suppliers across 11 Ministries, 8 main categories and 63 sub-categories.

Visualizing Supplier Networks

Traditional analysis of spend data might focus on providing drill-downs of data based on various charts and tables. In the end, most of these analyses are based on counts and sums of suppliers, categories and associated expenditures. This then allows analysts to, for example, gain insight into the importance of suppliers within each category, and locate spend consolidation opportunities based on spend totals within categories.

A network-based perspective on spend data focuses on the actual relationships between data points – in this case, between suppliers and the spend categories they are associated with. This opens up a new host of insights based on visual analysis of the same data: which suppliers are shared across categories? How does the distribution of small and large suppliers look from a visual point of view?

To start things off, let’s take a look at the smallest network across all ministries. The Ministry of General Affairs is the smallest Dutch Ministry in terms of employees, which is also reflected in the size of its supplier network: in 2014, this ministry did business with 538 suppliers across 36 spend categories (click to enlarge):

Supplier network of the Ministry of General Affairs

Supplier network of the Ministry of General Affairs

Squares are spend categories; circles are suppliers. The larger a node, the more expenditures are associated with it. Colors are clusters of suppliers and categories based on the density of connections within and between them.

The visual shows us that most of this Ministry’s spend is in the ‘8000’ category, described as ‘Communication various’ in the dataset. We see some of the country’s largest TV and radio channels here, as well as a number of firms specializing in commercials and advertisements. Total spend in this category was between 10 and 25 million, and thus seems mostly related to government-backed TV and radio campaigns. When we zoom in on the top of the network, we can see more of the suppliers in a number of other categories (click to enlarge):

Zooming in on various other clusters

Zooming in on various other clusters

Category 1150 at the left shows all suppliers in Learning & Development – 69 in total, with overall spend between 250.000 and 500.000 euros. At the right, we see some smaller categories relating to ‘Gifts not for own personnel’ and ‘Representation for own personnel’, with the latter one mostly made up of expenditures at restaurants and bakeries.

Next, let’s take a look at a larger network – the total supplier base of the Ministry of Economic Affairs consists of 5,365 suppliers across 48 categories, and clearly shows the composition of this Ministry’s expenditures (click to enlarge):

The supplier network of the Ministry of Economic Affairs

The supplier network of the Ministry of Economic Affairs

Out of all categories, 3120 (‘Outsourcing policy advice and research projects’) has most suppliers connected to it – 1,544 to be precise. Total expenses were between 50 and 100 million in 2014 alone, showcasing the importance of external research and advice for this Ministry. When looking at the top part of the network in more detail, you’ll see that quite a few suppliers operate across multiple categories. For instance, there’s a small orange group right in the middle which connects the 3120 cluster and the 1150 cluster (‘Learning & Development’) together – these are the suppliers which offer research projects, as well as training & workshops sessions to the Ministry’s personnel (click to enlarge):

Zooming in on the Ministry of Economic Affairs' network

Zooming in on the Ministry of Economic Affairs’ network

Judging from the sheer amount of suppliers active within and across categories, it may be worthwhile for this Ministry to consider consolidation and thereby reduce its expenditures along the way. This may especially prove worthwhile for suppliers that do business across multiple categories, who probably deal with various buyers in the Ministry’s organization at the same time.

Now that we’ve looked at the supplier networks of two Ministries, one grand question remains: what does the supplier network look like when we merge the spend data of all Ministries together? To focus on the key suppliers, the following visual shows all suppliers from the 10.000 – 50.000 euros range onwards. This totals 8,821 suppliers with 13,391 connections across 63 categories:

Full supplier network covering all Ministries

Full supplier network covering all Ministries

In one view, the above visual shows all purchase categories and key suppliers across all ministries. Many of the Dutch government’s largest suppliers are infrastructure & construction companies hired by the Ministry of Infrastructure and the Environment – 32 of the top 50 suppliers in terms of spend do business with that Ministry. At the bottom of the network, we see PostNL, the Netherlands’ largest mail company – the Ministry of Finance had expenditures between 100 and 150 million with them in 2014, reflecting the significant expenses of the Tax & Customs Administration in that area. All the way at the right, we see a category ‘VWS specifiek’, which deals with specific expenses by the Ministry of Health, Welfare and Sport. One of the key suppliers here is GlaxoSmithKline with a spend between 25 and 50 million. A quick Google search shows that this is probably related to large-scale buying of vaccinations.

Overall, the largest spend category in terms of number of associated suppliers is 7110 at the bottom left in the network, dealing with ‘Use and maintenance of buildings and terrains’. You can see some of the key suppliers in that category here:

Zoom-in on the Buildings & Terrains cluster

Zoom-in on the Buildings & Terrains cluster

Network visualizations such as the above can be a great complement to more traditional types of data analysis. They allow to quickly sift through large datasets, determine clusters of related entities, and visually locate important nodes and connections. In the context of the public spend data analyzed here, this allows the visual identification of potential consolidation opportunities, which has the potential to lead to significant savings. The publication of this dataset by the Dutch government is a great step forward in the Open Data domain – let’s hope we’ll get many more of these large datasets in the future.

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