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On the basis of the existing research results, we build an analysis framework of corporate offensive strategy. It studies the types of corporate offensive strategy based on power comparison between corporate and an opponent, and proposes a new offensive strategy - focus sideswipe strategy. With focus sideswipe strategy, the enterprise uses its own disadvantages to attack its opponent's flaws, and it can accumulate its resources to attack the rival's weak point. Meantime, it focus on approaches to realize focus sideswipe strategy from two dimensions: one is the target customers positioning and the other is the ways of creating customer value. This paper puts forward five approaches: geographical area focus, customer needs focus, product focus, service focus, brand focus, which provides new reference for enterprise competitive practices.

The system relative Effectiveness evaluation under uncertainty factors is the frontier of DEA Theory, research on DEA model with fuzzy elements can help resolve problems of the uncertainty input-output in systematic evaluation. From the perspective of efficiency set, the paper studied the DEA evaluation when the inputs and outputs were interval numbers, and proposed an interval number DEA efficiency set model and its sort method. With the help of the research, we can sort DMUs when they were IDEA efficiency, IDEA fuzzy efficiency and IDEA non-efficiency. Besides, the paper analyzed the application of interval number DEA efficiency set model in business performance evaluation, and pointed out the attentions of evaluating, which can help managers to apply the IDEA model in business performance management better.

This paper gives a system of enterprises' defensive strategy based on the comparison of three strengths, which are the attacker is stronger while the defender is weaker, the attacker is weaker while the defender is stronger and the attacker and the defender have approximately equal strength, briefly indicating the implementation of each strategy to help enterprises carry out their own defensive warfare.