ESIL (like most such things) is in no way a 'lens' because it does not reveal reality so much as it creates it. Yet is is still a useful framework for categorizing different levels of detail in conceptsd as they relate to learning. ESIL stands for 'Existence, Supported, Independent, and Lifetime'. For example, for solving quadratic equations, a student only needs to know that the method of 'completing the square' exists. They only need to be able to look up 'factoring' through performance support. They only need to be able to apply quadratic formulas independently. But they do need to be able to solve quadraticequations using technology as a lifetime skill.
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