Janet needs to assign a very important advertising account to one of her writers. First she reviewed each writer's work load, then she studied the sales data of the products for the last three campaigns of each writer, then she reviewed each writer's annual review to familiarize herself with their goals. Finally, she gave the account to Paula, a very creative, efficient, writer who has had high sales results with her last three clients' products. Janet's management style is based on
a. Organizational behavior studies
b. substantive evidence approach
c. preconceived notions
d. systematic study