A list of ALL the Business Rules used by your organization. Those rules should be represented in your ER diagram. I advise you to go first define your business rules and then derive your diagram from them.
Business rules by organization -
1. Every employee should be present by 9am and work 9 hours per day.
2. The company will offer a bonus of half a salary in april.
3. Every employee must under do a CPD course in order to get an increment.
4. Focus on your goals.
5. Invest money.
6. Earn profit or go in loss.
ER diagram -
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