4. The data entry operators at Michael Mulheren Construction have been making errors when entering the codes for residential siding products, which are as follows: U 5 stUcco, A 5 Aluminum, R 5 bRick, M 5 Masonite, EZ 5 EZ color-lok enameled masonite, N 5 Natural wood siding, AI 5 pAInted finish, SH 5 SHake SHingles. Only one code per address is permitted.

a. List the possible problems with the coding system that could be contributing to erroneous entries.

(Hint: Are the classes mutually exclusive?)

b. Devise a mnemonic code that will help the operators understand what they are entering and subsequently help their accuracy.

c. How would you redesign the classes for siding materials? Respond in a paragraph.