When Eurasia restaurant, serving Eurasian cuisine, first opened along Chicago's Michigan Avenue, its novelty brought many diners. However, it turned off the important business lunch crowd, and sales went into decline. Before conducting any marketing research to describe the declining sales management needs to:

1. define the problem to be researched

2. develop a survey to find out exactly what's wrong

3. enumerate the decision factors

4. select a market sample from everyone in the population

5. determine who will be most likely to respond to a survey