Abstract:

When you a complex task, it's always important to be able to separate what you have to do from how you will achieve the tasks. It allows you to have more options for solving the problem by separating concerns.

When you know exactly what you need to do you are more likely to find out how you can make it and what the possible options are...

Problem:

Context:

Forces:

Solution:

Examples:

Discussion:

Related Patterns:

DivideAndConquer : split a complex architecture or projectr in different components or tasks for which you give a very precise what. Let the how be defined by the delegate (just control the price ;-))

Known Uses: