Supportability is the ability of the software to be easily modified to accommodate enhancements and repairs, for example,
Suppose that we are building a new payroll system.
The user knows that the government changes the algorithm for this calculation each year
This change involves two numbers: instead of withholding X % of an employee’s gross salary up to maximum of $P, the new law requires the payroll system to withhold Y % up to a maximum of $Q