A retail store has hired a marketing consultant to help it decide how to evaluate the quality8 of its service. The store would like to evaluate customer perceptions about i = 1, employee attitude;

i = 2, employee competence; i = 3, product quality; and i = 4, sensory (look, sound, smell)

appeal of the store. The consultant is considering 6 survey instruments for the task: j = 1, pointof-

purchase cards measuring employee service delivery; j = 2, point-of-purchase cards measuring product quality; j = 3, open-ended comment cards; j = 4, a focus group of known customers;

and j = 5, a telephone survey of known customers.

The instruments are not equally useful in measuring the desired quality attributes, so the consultant has developed (1 = poor to 10 = excellent)

ratings ri, j scoring the value of instrument j in assessing attribute i. Instruments j would cost cj dollars and require hj hours of store employee time. Ideally, the instruments chosen should total at least 30 points on each rated attribute, but their total cost must not exceed $10,000, and the total employee hours invested must not be more than 500. Formulate a goal ILP to choose a suitable combination of instruments.