Kenneth S. answered 09/14/17
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
the phrase "this criteria" should be "this criterion" or, if plural, "these criteria."
Proper (enforceble) legal contracts must define the objective, e.g. task to be done or product to be built and delivered; the required timeframe (deadlines and associated penalties for late delivery, or possible bonus for early delivery); criteria for validating the correctness of the work and/or product; standards (including legal standards such as meeting building codes, compliance with federal labor laws, etc.)