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Strategy
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Strategy is a term that comes from the Greek strategia, meaning "generalship." In the military, strategy often refers to maneuvering troops into position before the enemy is actually engaged. In this sense, strategy refers to the deployment of troops. Once the enemy has been engaged, attention shifts to tactics. Here, the employment of troops is central. Substitute "resources" for troops and the transfer of the concept to the business world begins to take form.
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Strategy is about choice, which affects outcomes. Organizations can often survive -- indeed do well -- for periods of time in conditions of relative stability, low environmental turbulence and little competition for resources. Virtually none of these conditions prevail in the modern world for great lengths of time for any organization or sector, public or private. Hence, the rationale for strategic management. The nature of the strategy adopted and implemented emerges from a combination of the structure of the organization (loosely coupled or tightly coupled), the type of resources available and the nature of the coupling it has with environment and the strategic objective being pursued.[1] Strategy is adaptable by nature rather than rigid set of instructions. In some situations it takes the nature of emergent strategy.
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"A Strategy defines a set of algorithms that can be used interchangeably. Modes of transportation to an airport is an example of a Strategy. Several options exist such as driving one's own car, taking a taxi, an airport shuttle, a city bus, or a limousine service. For some airports, subways and helicopters are ... available as a mode of transportation to the airport. Any of these modes of transportation will get a traveler to the airport, and they can be used interchangeably. The traveler must chose the Strategy based on tradeoffs between cost, convenience, and time."
Strategy is about means. It is about the attainment of ends, not their specification. The specification of ends is a matter of stating those future conditions and circumstances toward which effort is to be devoted until such time as those ends are obtained.
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An alternate implementation approach for the Strategy pattern uses C++ templates. Templates have been described as compile-time (or static) polymorphism. Consider the following code example. The only expectations the OutsideClass places on the delegate object are: must have a do_one() method, and must have a do_two() method.
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