Maturity is a measurement of the ability of an organisation for continuous improvement in a particular discipline (as defined in O-ISM3). The higher the maturity, the higher will be the chances that incidents or errors will lead to improvements either in the quality or in the use of the resources of the discipline as implemented by the organisation. Find out what is the maturity of your ISMS with five simple questions. (In order to make it easier you can download free of charge the Maturity Assessment Tool)
. I mapped the Cobit, CMMI and O-ISM3 Maturity and Capability levels in this document:

And you can learn more about Maturity and Capability in this presentation: