As Reza posted down below, the term 'DSS' encompasses a wide range of systems, from small throw-away spreadsheets to large enterprise-scale reporting systems. The one thing they all have in common is that they help people answer questions through the collation and presentation of information.
The field of data visualisation deals with the graphical presentation of information, and while we're all familiar with pie charts and other graphs, data visualisation experts can help tell a story with data in a range of ways. DSS developers need to be familiar with data visualisation concepts: what works, what doesn't work and the idea that data isn't just a thing, it's the building blocks we use to understand a problem better and identify solutions.
People like Edward Tufte and Stephen Few are well know experts in the field, but a presentation by Hans Rosling a couple of years ago set the field on fire with his innovative data presentation techniques:
Cheers,
Rob.
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