Fyzio has given some great refs for the two versions of the Ashworth Scale. As far as I know there is no such thing as the Modified Modified Ashworth Scale. - but that doesn't mean it doesn't exist.

There are some fundamental validity problems with the Ashworth scales. the most important is that they fail to distinguish spasticity from other forms of increased tone at each level of the test.

For a measure of spasticity the Tardieu scale is superior as it really does measure spasticity - ie velocity-dependent resistance to movement:

The Tardieu Scale differentiates contracture from spasticity whereas the Ashworth Scale is confounded by it -- Patrick and Ada 20 (2): 173 -- Clinical Rehabilitation

http://http://www.ncbi.nlm.nih.gov/pubmed/16861197

Here is the scoring instructions:

http://www.mdvu.org/library/ratingsc...dieu_Scale.pdf