Abstract:A trend towards the provision of product-service packaging and the proliferation of service businesses introduces both tangible and intangible elements into system design. In this paper, we consider the utility of hierarchical system models as a way of flexibly combining such elements by focusing on requisite functionality. Four cases illustrate how the same approach may be used to clarify the requirements of business or socio-technical systems during system development, operation or reengineering stages. It is suggested that a suitable loosely coupled model has significant utility as a 'boundary object' -a term first coined in the study of museum artefacts. Discussion of such objects requires the use of imagination, which may support innovative system design and development. It is suggested that a well-crafted model has multiple uses -as a foundation for system development, in combining traditional and agile project management strategies and in providing a framework to facilitate the capture and organisation of project knowledge.Keywords: function mapping; boundary objects; IDEF0; GERAM; project management.Reference to this paper should be made as follows: Beckett, R.C. (2015) 'Functional system maps as boundary objects in complex system development', Int. J. Agile Systems and Management, Vol. 8, No. 1, Biographical notes: Ronald C. Beckett is an industry practitioner who works at the academia-industry interface. He is an Adjunct Professor at Deakin University and has more than 25 years experience in R&D, operations and strategic management in aerospace, plus more than ten years management consulting experience implementing creative change. He is a Fellow of the Institution of Engineers, Australia, and holds a Doctor of Business Administration (UWS) based on research into ways of implementing organisational learning concepts in a high technology company. He has written more than 100 papers related to innovation, collaboration and knowledge management. He is also the Board Chair of a recently formed industry-academia R&D collaboration the Alliance for Supply Chain Innovation, and lectures in support systems engineering at RMIT.