Check For Consistent Difficulty

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The most difficult part of writing a parametized question is making the questions consistently difficult. In order to be valuable to teachers, the question should produce variations that are approximately as "easy" to do as each other.


In order to check for difficulty issues:


Limit the number of variations.
Write the solution before you write the question.
Regularly regenerate the question as you are writing it.


Most difficulty issues will be avoided using this approach.