What can programmer questions tell us about frameworks?

In order to make frameworks easier to use we need to better understand the difficulties that programmers have with them. The questions that programmers ask give clues to the quality of design, documentation, and programmer practice. We describe the method and results of a study on the Java Swing framework. We collected and analyzed a sample of 300 newsgroup questions asked about two Swing components (JButton and JTree), and classified the questions according to the design features of the components. This process revealed key insights that can improve a framework´s design, its tutorials, and programmer practice.