These useful resources support demand and capacity modelling:

How Statistical Process Control can be used in demand and capacity analysis:

This video is a walkthrough of how Statistical Process Control can be used in demand and capacity analysis.

Additionally, the Demand and Capacity programme has produced a range of resources that teams can use locally.

How do waiting lists grow?

Does variation in either demand or capacity at different levels of the treatment pathway impact on waiting lists and treatment times? Does providing additional resources at fixed or varying points of the treatment pathway fix the problem? Play the interactive game to find out.

For more information, please email the team at

How do you calculate an ideal waiting list size?

This short animation explains the importance of an ideal waiting list size, and how to calculate this.

How are percentiles used in designing service capacity, and how do we calculate them?

Watch this short animation to find out how percentiles can be used in demand and capacity analysis

These websites provide tools and techniques in demand and capacity modelling which were first introduced by NHS Institute for Innovation and Improvement.

These are now hosted on the National Archives pages: