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。
2
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。
3
In addition to results, the history element also keeps track of which providers, categories, and rules were selected.