单项选择题 （）is a category assigned to products or services having the same functional use but different technical characteristics. It is not same as quality.

单项选择题 Project Quality Management must address the management of the project and the（） of the project. While Project Quality Management applies to all projects, regardless of the nature of their product, product quality measures and techniques are specific to the particular type of product produced by the project.

单项选择题 In approximating costs, the estimator considers the possible causes of variation of the cost estimates, including（） .