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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Sites such as Facebook, track user clicks by adding the "ref" parameter to each navigational element. Below is an example of how Facebook links their logo.

拿Facebook为例，它为每一个导航元素增加了“ref”属性来跟踪用户点击。

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In addition to results, the history element also keeps track of which providers, categories, and rules were selected.

除了结果之外，history元素还保持同被选中的提供者、类别和规则的联系。

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The Track Data story contains one other interesting element.

FORBES: Tracking Track Data

They are no longer prepared to sign up to 20- or 30-year franchises as long as a key element of risk, the state of the track, remains outside their control.

ECONOMIST: A better way to run a railway

When the stock market is overvalued fundamentally it becomes more important to track the technicals as on market strength momentum becomes an important element of your stock selection.

FORBES: Overvalued Fundamentals And Overbought Technicals Means It's Time To Look To Reduce Market Exposures