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1. Self-analysis: strength and weakness2. Find out competence and performance required duties3. Gather information about history, functions and development4. Imagine the problem answer
I do agree and - put is a must - that interview should be prepared for accurately and fully.
Of course you should prepare for it, but I think it's a self-friendly and experienced and highly skilled confidence does not need to prepare for the interview
Yes, this is what you usually do