You have an interview screen that collects the attribute ''the person's age in years''. Your customer requires that an error message be displayed if ''the person's age in years'' is less than 0 or greater than 120.
You are working in a project where you need to develop a rule to calculate the currency attribute ''the person's total taxable income''. The person's total taxable income is either the sum of the attributes ''the person's wages'' and ''the person's interest'' or $50,000, whichever is lower.