When someone says that their premium-priced propriety system / SOP is the
world's best that can cure all ills in one area of human endeavour, take
that with a pinch of salt.
Unfortunately, one size does not fit all.
Trainers, consultants, and service providers should not enslaved
("certified") by one propriety system but give their clients what's best for
them after a needs analysis consultation with the client.
http://www.aeronchair.co.uk/images/AeronAllShapes.gif
https://assistivetechnologytidbits.wikispaces.com/file/view/udl_pic.png/35294157/udl_pic.png
Cheers!
G. K. Lim
http://www.gklim.com