<para>DrJava is a lightweight, powerful Java development environment. Its target audience includes both beginning Computer Science students and advanced professional users. Clearly, there is a tension between these goals &mdash; "lightweight" versus "powerful"; "beginning" versus "advanced." This tension is generally resolved by <emphasis>ensuring</emphasis> the prior conditions &mdash; that DrJava be easy to use and inobtrusive for beginners &mdash; and adding "advanced" features only if they can be presented in a simple, lightweight (both in terms of system resources and user interface) manner. The interactions pane is an ideal example of a nice marriage between the goals of simplicity and power. It is easy for beginners to understand and use &mdash; in fact, it's where many beginners get their first taste of Java programming. Yet professional developers also find it quite handy, and sometimes lament the lack of something like it in heavier-weight IDEs.</para>