User interfaces should:

a. provide clear instructionsprovide data that needs to be input
b. provide spell checkprovide clear instructions
c. provide error messagesbe consistentprovide clear instructions
d. provide data trappingprovide longitudinal testing
e. provide clear instructionsprovide redundant instructions
f. provide only feedback for errors

cad, or computer-aided design and drafting (cadd), is a software for design and technical documentation, which is an automated process as opposed to the manual drawing of plans. this gives a person an advance in making plans as an architect in a short period of time. one who can render plans through this software will gain a skill that is better than one who makes plans manually. this is a skill some companies look for in an employee.