Marvellous Explanation!

A newly-joined chemist asks his boss 'What is the meaning of appraisal?'

Boss : 'Do you know the meaning of resignation?'

Chemist : 'Yes, I do.'

Boss : 'So let me make you understand what an appraisal is by comparing it with resignation.'

Appraisal	Resignation
In an appraisal meeting they will speak only about your weakness, errors and failures.	In a resignation meeting they will speak only about your strengths, past achievements and success.
During an appraisal you may need to cry and beg for even a 5% pay hike.	In a resignation meeting you can easily demand ( or get more without asking ) more than 50-60% pay-hike !
During an appraisal, they will deny promotion saying that you did not meet the expectation, you don't have leadership qualities, and that you had several drawbacks in reaching objective/goal.	During resignation, they'll say you are the core member of the team; that you are the vision of the company, and so ' How can you go ? '; you have to take the project on your shoulders and lead your juniors to success.
There is a 90% chance of not getting any significant incentives after appraisal.	There is a 90% chance of getting an immediate pay-hike after you put in your resignation.

Chemist : 'Yes, boss, good enough. Now I know what to do. When you are about to do my appraisal, I will resign.'