Test taking and MathML

The MathML interest group is in the final process of collecting suggestions for what a MathML 3 Working Group should consider as part of its scope.
 
I proposed that the committee should consider the needs of people taking tests.  One such need is the ability to say that a certain area is editable so that the test taker can only fill in (for example) the right hand side of an equation or the coefficients of a polynomial.
 
Does anyone else have any suggestions for requirements related to test taking?
 
Does anyone think this is *not* an area a working group should explore?
 
If you have any burning issues that you haven't found a good solution with the current MathML spec, now is the time to raise them so that they can be considered by the next working group.  You don't need to propose a solution, just a general area for which the group should explore a solution.
 
Neil Soiffer
Senior Scientist
Design Science, Inc.
neils@dessci.com
www.dessci.com
~ Makers of Equation Editor, MathType, MathPlayer and MathFlow ~