Step 1: Definition of Control in Management
  
Control in management refers to the process of monitoring, measuring, and correcting activities to ensure that the organization’s goals are achieved as planned.
Step 2: Role of Control in Supervision
  
Control simplifies the task of supervisors by:  
- Ensuring Accountability: It helps supervisors track employee performance and hold them accountable.  
- Identifying Deviations: Control allows supervisors to quickly identify any deviation from the planned performance and take corrective action.  
- Promoting Efficiency: It ensures that resources are used effectively and efficiently.
Step 3: Conclusion
  
Control is crucial in simplifying a supervisor’s task by ensuring that everything aligns with the set goals, enabling easier decision-making.
  
 
Final Answer:  
\[
\boxed{\text{Control helps supervisors by ensuring accountability, identifying deviations, and promoting efficiency.}}
\]