Robin wants to find the perfect gift for her grandparents' 50th wedding anniversary. She started looking for the gift last month and expects to spend another couple of months if needed to find a gift they both will like. Robin is engaging in

Extensive Problem Solving.

Explanation:

Robin is engaging in extensive problem solving by trying to get all the information she needs in order to make a choice on the best gift for her grandparent's 50th wedding anniversary.

Extensive problem solving: This can be defined as the process by which a buyer makes decision on the kind of product to purchase without having a prior knowledge or information about the product. It could be stressful and time consuming.

Extensive problem solving usually arise when buyers discovers there is a need that is new to them and the need requires a lots of effort to satisfy it. It involves getting information on the product to selecting the best brand. Robin is searching for a gift that will be accepted by both her grandmother and grandfather.