Know your data :
Whenever you get some data from the process owner, spend some time to understand it. If you have some doubt, then straight away ask the process owner. If there are 20 columns in your excel sheet then you must know the purpose of each of them and how they are linked to one another.
If you start your analysis before understanding the data then there are high chances, that you will do it wrong and this will result into waste of efforts.
Most common mistake people do is wrong interpretation of dates to calculate TAT.
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