Answer: Team leader
Explanation:
Team leader is the person who provide guidance and instruction to group of employee in an organization .The decides certain timeline under which employees are intended to complete the project goal of developed plan.Team leader also maintain integrity and promotes team spirit so that team can reach the goal.
According to he question,Heather is the team leader of cashier team as he developed the customer improvement scheme.He also performs the duty of directing and instructing the team members .