An insight: Building a good project structure is not easy

I wanted to learn something about Ant, the java build tool. So I went to the local library and borrowed O'Reilly Ant book. Flipping through it, I saw this section

"Designing and implementing a project structure is not a trival task, so do not assign and dedicate less than an hour of work to it and think you will do a good job".

How very true. This means that it is worthwhile to take note of the directory structure when studying the source code of any good software.