Hi,
why don't you google it?
I got e.g. this link:
SpringerLink - Journal of Neurology, Volume 247, Supplement 6

Otherwise: the presentation of MND (by the way ... which one ?) is so varying, you will be able to apply any of the neurological outcome measures +/- respiratory outcome measures as indicated by the deficits found in your assessment.

There is quite some information on neurological ones here:
Neuro Outcome Measures

And you should also find heaps of references on outcome measures in this section of the forum.
Hope this helps.

Regards,
Andrea