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This paper reviews the functionality associated "data modelling" and "conceptual modelling". The history and origins of each term are considered, together with the current interpretation of each term. The term "information modelling" is also taken into account. Alternative representation forms are presented and reviewed. The merit of diagrams as a basis for a dialogue with a subject area expert is indicated. The paper suggests that a clear distinction is needed between data modelling anddoi:10.3127/ajis.v1i1.431 fatcat:yjje7iedfzfzrjrtrx2z7unwyq