2Further Reading: Chapman EK et al. (1989) Look and Think: Visual Perception Training for Visually Impaired Children (5-11 years). Royal National Institute for the Blind, London.

VERY Technical point:

The thematic structure adopted above was selected and then altered to suit our own requirements on the basis of a logical progression. It is a layered structure. Each layer is dependent on the one below, and potentially able to support the one above (but not requiring it).

if p > p (where p implies p)
if q > p (for q to exist; ie the next level up, then so too must p, eg; Attending needs Awareness
if not p > not q (if p does not exist then neither does q, nor those levels above).