The thinking process of designers is one of the most important issues in design research. This paper intends to enlarge design thinking theory and research by taking a close theoretical and empirical look at the very basic elements of thinking in design. Based on theoretical assumptions, thinking in design is reduced to the four basic cognitive operations of generation, exploration, comparison and selection, which, in various combinations, are applied to the goal space and the solution space of a given problem as well as to the organisation of the collective process of teamwork.
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