Types of decisions

• Structured  -  TPS
• Semi-structured  -  MIS and DSS
• Unstructured  -  ESS

Levels of decision-making

• Supervisors  -  TPS
• Middle management  -  MIS
• Executives  -  ESS

Level of decisions

• Operational  -  TPS
• Managerial  -  MIS
• Strategic  -  ESS