Are you saying the argument structure for all strengthen questions is either cause and effect or necessary sufficient??
I think those were two examples of common things to look for.
Thanks Jeffort. They are the most common type of argument structure tested on the LSAT and come up many times on strengthen, Necessary Assumption and Sufficient Assumption.
It helps to identify this structure in order to isolate the conclusion and then strengthen it!
It is the same idea for weaken. Isolate the conclusion and identify the argument structure. If it is C&E find the answer that give you C without E or E without C or an alternative cause.
For Sufficient Necessary weaken question, the only way to weaken the argument is to show the sufficient condition happening without the necessary.