The Fundamentals feature gives you the ability to see your team's performance across the fundamental productivity metrics for both submitters and reviewers.

Submitter Fundamentals provide a bigger picture regarding the submitters metrics. You can select which team's performance to view, which repositories' contribution to analyze and what period to inspect. Each metric has its own average value which you can see in the tab view or on the left side of the chart.
This tab analyzes the Responsiveness (the average time it takes to respond to a comment with either another comment or a code revision). Click on the metrics tabs (Responsiveness, Comments Addressed, Receptiveness and Unreviewed PRs) to scroll through them. Each metric has a corresponding chart.

If you hover over a column in the chart, you'll see the metric's value for that particular period.

This tab analyzes the Comments Addressed metric (the percentage of Reviewer comments that were responded to with a comment or a code revision). 

This tab evaluates the Receptiveness metric (the ratio of follow-on commits to comments).

This tab investigates the Unreviewed PRs metric (the percentage of PRs submitted that had no comments).

Reviewer Fundamentals offers an overview regarding the reviewers metrics. You can select which team's performance to view, which repositories' contribution to analyze and what period to inspect. Each metric has its own average value which you can see in the tab view or on the left side of the chart.
This tab analyzes the Reaction Time (the average time it took to respond to a comment) metric.

This tab analyzes the Involvement (the percentage of PRs a reviewer participated in).

This tab analyzes the Influence (the ratio of follow-on commits to comments made in PRs).

This tab analyzes the Review Coverage (the percentage of PRs reviewed).

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