The conceptual attitude of the architects and designers of the Dutch Forum group, first formulated in the 1960s, was in part a reaction to the analytical values associated with aspects of C.I.A.M. and was based upon observations of cultural attitudes and changes in society. The way we experience our environment and the result that the experience has on our lifestyle prompted Bakema, who with van Eyck and Hertzberger was a leading figure of Forum, to ask what was the function of formal expression and 'what kind of changes in society is developed by our designs'. Forum considered that changes in lifestyles could be reflected in the nature of architecture and in the way the user could participate in the creation of his environment. The urban architect ought to provide patterns which would allow man to identify his own personal space. This could be discovered in civilisations which had evolved in order that people could express in spatial terms their own way of life. Bakema felt this to be achieved 'less by designing complete types but more by designing conditions for the quality of life'. One question posed by this was, how can the changes in urban design occur so that unpredicatable events could happen. To achieve this Forum considered that an overlap between public and private concerns should be allowed in the decisions taken about social and environmental problems. The social responsibility of the designers was an essential feature of the approach of Forum and formal decisions were a part of the artistic and cultural will of the individuals. Aldo van Eyck emphasized that discussions should be 'critical and inclusive, never intolerant and exclusive'. That led to the initial programme of Forum which was related to The story of a different thought'. There was a concern for man's identity with nature and his experience of his environment. This also involved the transitions between the scale of elements and perceptual factors. One aim was to reflect upon the place of the individual and the changes in the structure of the community. On the whole the imagery and the way Forum sensed the needs of a changing society was reflected in observations of the way various cultures organised the physical form of their society. There was a feeling that too little scope was allowed by the patterns of urban form for the differences and diversities of human behaviour. One aspect of this was the disappearance of 'transitional motifs'. Context was important to Forum and to Bakema who emphasized the implications of continuity of form that allowed structural adaptability and this could also be discovered in examples from history. The paper draws upon research work into both the magazine Forum and the individuals n volved in the group.