Sorry was a bit late when i wrote it, made a bit more sense to me at the time

Will try and clear up a bit better.

From a questionaire an individual ends up with a points total. this points total then relates to a point on a grade structure, so different point bandings will equal a different point on the structure.

The 2 columns represent 2 different schemes being used (so in all reality i could use the same formula/ expression and just change the point boundries).

e.g

person A scores a number of points, on the scheme being used anyone who scores between 200 and 300 would end up in grade 3 on scheme 1 and in grade 5 in scheme 2, anyone who scores between 301 and 400 would end up in grade 4 on scheme 1, and grade 7 on scheme 2 etc.

Hope that makes it a bit clearer.