Description: Change a constraint (data type, size, etc) to simplify the problem Then try to solve it Once you have an algorithm for the "simplified" problem, generalize the problem again.

说明：通过改变一些条件，(比如数据类型或者问题的规模)来简化问题，然后设计一个算法来解决这个简化过的问题，然后在问题一般化还原回来。

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But his job description is not permanent - and that will change after the Schofield report, taking power away from the coach.

BBC: England to limit coach's powers

With all this in mind, the Bank of England's incoming Canadian governor, Mark Carney, has called for a debate about whether to change the Bank's job description.

BBC: Budget 2013: Radical options for the UK economy

The job description for Benedict's successor, whoever he may be, must reflect this sea-change in the requirements for the leadership of the Roman Catholic Church which has occurred during this first full papacy of the 21st Century.

BBC: Pope Benedict: Will retirement seal his legacy?