Home Tempe Supervisors Association The Tempe Supervisors Association independently represents the interests of their members through contract negotiations grievance arbitration employee representation and by striving to provide the best benefit package possible Contract NegotiationsAs the official bargaining agent for supervisory employees of the City of Tempe TSA is responsible for negotiating wages benefits and working conditions to ensure the best outcomes for our members. What does TSA do for its Members. Discipline Grievance Representation TSA represent its members during any disciplinary or Grievance processes. Our representatives ensure that personnel rules discipline guidelines and MOU rights are fully adhered to safeguarding the interests of our members.