Rich pictures are generally constructed by interviewing people. The ideal interview should take place at the workplace because the artifacts people use to do their work will be close at hand. They will be able to show you documents and products, and you may even be able to observe them doing their work. The rich picture serves to organize and reason about all the information that users provide. Drawing the picture will point to places where you need to find out more or to apparent contradictions in the conclusions you have drawn. In the latter case you will need to go back to your informants and then make changes based on what they tell you. Drawing a rich picture then is an iterative process of understanding and refining that understanding.