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Harvey’s hypercodes and the “Propogram” – More than 24 hours per day?Keywords: Time use , childcare , multiple simultaneous activities Abstract: In the 1980s, Harvey originated the key concept for the representation of multiple simultaneous activities without violating the constraint of the 24-hourday – the "hypercode". This implements his conceptual innovation in the context of childcare, and suggests a means of graphical representation.
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