3-Stage Service Process:
The Standard Three-Stage Model
This framework describes how nearly every system converts an initial state into a final result:
Pre-Service / Pre-process (Input): The collection of raw materials, data, or triggers required to start.
Servicing / Processing (In-between): The active phase where the work, calculation, or change happens.
Post-Service / Post-process (Output): The final product, result, or response generated. (PAYMENT)