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| − | The strategy pattern is useful when there is a need to separate the implementation of a process from the class that uses it.
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| − | There are several reasons that this can be useful.
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| − | [[Image:Strategy pattern.jpg|frame| The strategy pattern]]
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| − | * There are several different versions of the algorithm to implement.
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| − | * The algorithms are used in more than one place. [[Once and only once]]
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| − | * There is a need to create an encapsulation boundary around the algorithm to hide implementation details.
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| − | * The class using the strategy implements many different behaviours choosing which behaviour to use with ''if'' statements. Each choice can be represented as a strategy instead simplifying code and making the intent explicit.
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| − | In Design Patterns by the [[Gang of Four]] the object using the strategy is called the Context
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