From a good friend, a retired SE, who has a son with significant physical disability
http://files.ctctcdn.com/137c2ed6201/817b1d14-318b-4316-80b5-bfdb3f8cfade.pdf?utm_source=Copy+of+2015+Abilites+Digest+Spring+Issue&utm_campaign=2015+Spring+Abilities+Digest&utm_medium=email