How to write a good bug report

A good starting point would be the [mozilla bug writing guidelines].

Here are some basic principles:

• Be precise
• Be clear - explain it so others can reproduce the bug
• One bug per report
• No bug is too trivial to report - small bugs may hide big bugs
• Clearly separate fact from speculation

Preliminaries:

• Reproduce your bug using a recent build of the software, to see whether it has already been fixed.
• Search moodle bug tracker, to see whether your bug has already been reported (sometimes might be tricky).