Investigation Heuristics

Error Logs

E-mail Conversations

Debugging Tools

Source Code

Bug Timestamp

Note down the time when you found that bug.

State of system

Release Notes

Questioning

Make friends with

 Developer

 Sales Folks

 Marketing Folks

 Database Administrators

There is no one right way to do it

Use MEA (Means-Ends Analysis)

Go beyond 4 walls & seek help

Be a Journalist (Take notes)

 Notepad

 Capture video

 Take screenshots

Follow-up testing

Cem Kaner

Follow your instinct / intuition

Make some assumptions

Trial and Error approach

Past Experience

 Similar incident?

 Ex-colleagues help?

If your colleague faced it.