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In the Model of Hierarchical Complexity (Commons & Pekker, 2008), stage is defined as the most hierarchically complex problem that is solved.?An items hierarchical complexity depends on just three conditions being met, the higher order task action has to be defined in terms of?two or more lower order task actions, it has to organize them, and in a non-arbitrary manner.?As Kurt Fischer among others points out, there are many different strategies that will correct complete a task.?So stage and strategies to address problems are one and the same thing.
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