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Workflow Engines: Why use them

Basically, as a programmer when you are presented with a certain tasks, you have about a 100 ways to accomplish them. The path you take to solving the problem depends on so many factors. One i think is quite obvious is your experience with certain tools. In a programmers “toolbox”, one tool that shouldn’t be missing is a Workflow Engine.

What is a Workflow Engine?
Simply put, a workflow engine is an app that helps define a workflow process, the constraining rules guiding the decisions in the process flow and the information to be passed along in the process timeline.
Lets take a Cash withdrawal (from the teller machine) process as a typical example. The process can be defined into the following steps:
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