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但是应该允许公司、特别是小型的，不受这种规定的约束，以便他们能更好地来让人工成本和生产力相匹配。
But firms, especially small ones, should be allowed to opt out of such arrangements so that they can better match Labour costs to productivity.
人工的约束或者用户定义的查询需求。
本文由人工排课过程中提取的两个概念(排课准则及课程结构)推导出排课知识中的规则及约束集。
The rules and set of constraints in the knowledge can be deduced from two concepts-structure of a course and criteria of timetables, identified from manual process.
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