1. A model representing at least part of an organisation, said model comprising: a plurality of interconnecting layers of information including a first, base, layer or layers which include the identity of different aspects of the organisation and elements and/or properties relating to the performance of the same, said layer including data retrieved from one or databases of the organisation and/or external database sources and allocated to one or more of the aspects, elements and/or properties and wherein there is provided at least one further layer which includes information identifying the causal links between the said aspects, elements and/or properties identified in the said first layer said casual links developed with reference at least partially to information obtained from one or more human resources.