I'm not sure this is right but this is how I structure my 20 markers:
e.g. Evaluate these two options...
option 1:
definition
advantage (try to find two) - application (apply to business using evidence from source)
disadvantage - application
(when writing application try to use MOPS: m - market, o - objective, p - product, s - situation)
option 2:
definition
advantage - application
disadvantage - application
conclusion:
for conclusion try to use AJIM: a - answer the question, j - justify, i - it depends on, m - most important
Hope this helps!