"Multi Perspective Enterprise Modelling" (MEMO) is a method to support the development of enterprise models. It includes a number of specialised modelling languages, like the MEMO Object Modelling Language (MEMO-OML) or the MEMO Organisation Modelling Language (MEMO-OrgML). MEMO-OrgML is to provide concepts that help with the design of meaningful models that support systematic approaches to organisational analysis and design. Like any MEMO language, MEMO-OrgML should promote models that are intuitive for various groups of users - which includes the semantics of the concepts as well as the way they are rendered within a model. In order to be intuitive, the concepts and (graphical) symbols a modelling language offers should correspond to existing concepts and their visualisation. This is the subject of this report: It gives an overview of core concepts to be found in the literature on organisational analysis and design as well as common ways to visualise various aspects of an organisation. The concepts are discussed against the background of generic objectives related to organisational analysis (re-) design. It is the main purpose of this investigation to prepare for a major revision of the current version of MEMO-OrgML, hence to detect further and more detailed requirements an organisation modelling language should fulfil. Research into the phenomenon of organisation and organising has many facets. From the perspective of organisation theory, those studies - be they behaviouristic or hermeneutic - are of outstanding importance that aim at explanations and/or try to foster a deeper understanding of core concepts. They include the analysis of power, social psychology, the relationship between structure and performance or the use of metaphors to illustrate certain aspects of organisations. The focus of this report, however, is different: While useful insights provided by organisation theory will not be completely neglected, the emphasis is on terminology and language that is useful for the purpose of modelling organisations. As one result, the report presents a dictionary of essential terms and graphical symbols which are common to describe organisations.