Use Plain English.
Use grammatically correct English.
Please don’t use slang, short-hand, or SMS-speak.
Explain things. Assume that the person reading your report is a six-year old.
Please mention how often the bug occurs (always, seldom, rarely, intermittently).
Can you reliably re-create the situation that leads-up to the bug? If so, please list down the steps, in detail.
Thanks for listening.
Comment (1)
Step 4 is imp. Be Explicit. Documenting bug using Trac etc is good.