Perceiving the affordance of a tool requires the integration of several complementary relationships among actor, tool, and target. Highers order affordance structures are introduced to deal with these forms of complex action from an ecological-realist point of view. The complexity of the higher order affordance structure was used to predict the difficulty of perceiving the tool function. Predictions were tested in 3 experiments involving children between 9 months and 4 years old. In a classical tool use task dating back to W. Köhler, a desirable target was obtained by using a hook as a tool. The relative positions of the hook and the target were systematically varied to obtain structures differing in complexity. The observed difficulty of the task was found essentially in accordance with the theoretical complexity of the higher order affordance structures involved in perceiving the tool function.

In this paper, we highlight the issue of integrating the audio and tactile sensory experience into the design process of toys and computer games. Our approach is to address and incorporate design issues for the sensory impaired at the beginning of the design process, to design for their abilities rather than compensating for their disabilities. The children are engaged as co-designers. The scenarios outlined in this paper are an example of inclusive design.

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