To maintain matrix accreditation your organisation and its service will need to have a review every 3 years.
There are some questions that you should consider and ensure your Assessor is aware of during the planning stage of your review. These are outlined below:
Has your organisation significantly grown or declined since your last assessment? Has your organisation and its service changed at all? Have you re-structured? Have there been any changes in your key personnel?
Feedback from your previous assessment
Did you consider and implement any of the Areas for Continous Improvement suggested by your Assessor? Are the strengths identified by your Assessor still valid and have you built on them?