Problem definition    It is important that we know exactly what problem we have to solve. This may appear to be trivial, but without a precise problem definition, we might develop a computer program that solves a problem other than the intended problem.         ~~~~Problem definition of the payroll problem~~~~ 'A factory wants to calculate the daily wages for its employees. The wages are obtained by mulyiplying the hourly rate of individual employees by the number of hours worked. However, if the number of hours worked exceeds 7, an allowance equal to 40% of the hourly rate will be added to each overtime hour.'