What is the difference between status and decision?

Status tracks where a review is in its lifecycle, and Decision tracks what happened to the workspace.

• Status tracks where a review is in its lifecycle (Pending, In Progress, Completed, Expired, Canceled).
• Decision tracks what happened to the workspace (Reviewed, Archived, Deleted, Rejected, Unreviewed, or a custom action name).

They are independent. For example, a Completed review can have a Decision of Reviewed or Archived.