tasks can be described as the set of declarative and procedural
knowledge components relevant to the task.
Third, both declarative and procedural knowledge
become strengthened with use (and weakened with disuse).
Strong knowledge can be remembered and called
to attention rapidly and with some certainty. Retrieval of
weak knowledge may be time-consuming, effortful, or
impossible. Different knowledge components may represent
different strategies or methods for accomplishing
a task (including incorrect ones). The relative strength
of these components helps determine which strategy is
used. Learning involves the development and strengthening
of correct, efficient, and appropriate knowledge