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*From*: Karim Diff <karim.diff@gmail.com>*Date*: Sat, 13 Nov 2021 15:09:16 -0500

This is one of the features I like in Learning Catalytics (from Pearson).

It's not free but it is relatively cheap ($12 / 6 months) and is not tied

to any LMS.

The "Expression" question format recognizes equivalent symbolic

expressions fairly well. There are just a few restrictions like having to

type sin(θ) instead of sin θ.

There is also a numeric question format where students have to enter units

(provided you put that in the set-up (something I can't do on Canvas, our

LMS). So both 0.5E-3 A and 0.5 mA are considered correct even if I coded

the response in only of these forms.

Almost a full semester later and my students still get caught doing the

calculations correctly but not putting the unit (or sometimes the wrong

unit) when they type in their answers.

Oddly enough this system does not have questions with randomized values.

I wonder if other LMS systems will also adopt this STACK system or

something similar. Canvas has a few things but the STACK list seems more

extensive.

Karim Diff

**References**:**[Phys-L] Testing formulas for equivalence in moodle .... Coniectura multiplex delenda est.***From:*John Denker <jsd@av8n.com>

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