Input-Process-Output Model

Input stage:
Influences customer's recognition of product need.
Two major sources of information:
1. Company's marketing effort
2. External social influences of the customer.
Affects what the customer purchase and how they use, what they buy.

Process stage:
Focuses on how Consumers make decisions.
Psychological factors inheret in each individual affect how the external inputs influence the consumer's Need recognition, Pre-purchase search for information, and evaluation of alternatives. This in turns affects the consumer's existing Psychological Attributes.

Output stage:
Consists of two closely related Post-decision Activities.
1. Purchase behavior.
2. Post Purchase evaluation.