Defining a Metric

A number that a product team tracks over time, such as weekly active learners or a lesson completion rate, is a metric. Each metric is computed from a rule with four parts: what is counted, what the count is divided by, which days are included, and which rows are left out. These four parts are called the numerator, the denominator, the time window, and the filters, and written down together they are the metric's definition.

Two people can use the same metric name and report different numbers, because each filled in the four parts differently