Each step about data which are collected, reported and manipulated has an error rate associated with it. Therefore, measuring data quality is a key element of quality control for clinical trial data.

临床试验数据的采集、报告与处理的每一步骤都可能伴随错误，临床试验数据质量的评估是临床试验质量控制的重要措施。

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A critical element in the overall quality of a solution is the ability to track the requirement through all stages of the development and delivery process.

在一个解决方案所有质量因素中最关键的是跟踪开发和交付过程所有阶段的需求能力。

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This makes for more comfortable shooting conditions, and from the right vantage point, the reflective quality of the smoke can add an element of interest to the shot.

这可以创造更舒适的摄影条件，从有利于摄影的角度来看，对烟雾的反射还能够增加更好的摄影元素。

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The quality of provision is an essential element and this quality can only be ensured by providing adequate systems of professional training for the teachers involved in the programme.

UNESCO: The Basic Competence in Working Life Programme

Another important element of a high-quality RCT is the random assignment of patients to treatment groups.

FORBES: Clinical Trial Advice For Investors From Two Pros

Mr Blair wants to introduce more choice and an element of competition, to drive up quality and keep the demanding middle-class consumer satisfied.

ECONOMIST: Browned off with Blair?