Hello Tracy,
The project status changes to:
At Risk (Amber) - If the Actual Percent Completed is 10% or more below the Expected Percent Completed
Off Track (Red) - The due date of the task has passed and the Actual Percent Completed is less than 100%
Here is the article: http://usermanual.clarizen.com/4-3-7-scheduling-status
For further clarification, please join our Q&A session and we will demo some examples for you.
All the best,
Diana