Analysing and modelling GUI selection techniques

In this thesis we examine and model selection techniques that are commonly used in graphical user interfaces. Our emphasis is on modelling the Rectangle and Lasso selection techniques. We model these when selecting an object or set of objects with and without other constraints present. We use Fitts' Law and the Steering law as base models.; We describe three user studies where participants performed 8 defined tasks in total. In each of those tasks the participants were to make a stroke, given a set of constraints. We analyse the results of the user studies and introduce models that aid research in the selection techniques area of human computer interaction.; One user study is conducted to re-evaluate the Steering law. Fitts' law contains a notion of effective width, which is lacking from the Steering law. We provide experimental evidence that effective width is an important aspect of the Steering law and should be carefully considered. We also propose such a model including this notion.