I was given the Tampa Electronics, in which it has ten traveling salespersons that make frequent trips from Tampa to major cities in the southeastern United States, the case requires to uncover fraud. The case file that has an excel sheet with salesperson, cities, rates, approvals, and travel expenses. I want some advise on how to go about it, this is apart of the assignment: The case study involves the identification of potentially fraudulent travel expense reimbursements. In the case scenario, traveling salespersons submit expense reimbursement claims, which are subject to a number of business rules. Using the data provided as well as data analysis techniques, you are required to identify potentially fraudulent travel expense reimbursements.

Where should I start or how do I go on about to uncover fraud, well the concepts to it? How would I explain it?