The working hypothesis in this paper is that many organisations do not view measurement systems as resources and therefore miss out on opportunities. Here, organisational sustainability is interpreted with the dimensions of the Triple Bottom Line that monitors economic, environmental and social performance. The ideal measurement system should track performance and improvement potential in all dimensions. Most measurement systems today are functionally based and highly focused on the economic results. Even if approaches such as the Balanced Scorecard are used this still does not automatically mean that there is focus on the processes were value is created for customers and other stakeholders. With a low level of measurement system effectiveness the quality of facts used for decisions deteriorates and logically also the performance. This means that the maturity of the measurement system could be an indicator of organisational performance. A model for measurement system maturity is proposed and tested with case studies in chosen organisations and processes. The assessed maturity is then compared with the existing improvement potential as perceived by the organisation and as assessed by the researchers. The level of non detected potential is related to the maturity of the measurement system. Results indicate that there should be more focus on and ownership of a companywide measurement resource.