Critical Reasoning

Hi guys

I was wondering how people approached CR strengthen weaken Qs...

I have so far completed the OG and verbal review CR sections and have scored over 90%. However, my practice verbal scores have fluctuated drastically - from 36 to 41, and I think this is mainly down to CR. In parcitular, I'm lacking a strong, consistent approach when dealing with strengthen weaken type Qs, which seem to be the most common Qs amongnst CR Qs ...

I've looked through most books - Kaplan, Princeton etc. Ususally,

For strengthening Qs - I tend to approach the Qs by thinking in my head that 'the argument makes even more sence because the answer choice eliminates any alternative causes' and for weakening Qs - I tend to approach the Qs by thinking that 'the arugment doesn't necessarily make sense because of an alternative cause' as you can see, I don't have a set framework / approach in dealing with these Qs...

Desperately seeking some advice here!

MAny thanks

Hello,

The first step is to identify the conclusion (what the passage is trying to prove) and the premises (the reasons for the conclusion). All of the premises must be considered as true. There will be some logical flaw in the reasoning -- the hidden assumption. In a strengthen question, the answer will make this assumption true. In a weaken question, the answer will make it false.

To find the hidden assumption, see if there is any critical concept in the conclusion that is absent from the premises -- and vice versa. The assumption is that these two critical concepts are linked. Otherwise, think about arguing against the conclusion over a beer; you would say yeah, all that may be true, but your conclusion is still wrong. On the GMAT, this assumption many times involves one of the following: (1) assuming that when two events are correlated, one caused the other; (2) assuming that an anology/comaprison between two things is fair; and (3) assuming that a survey or sample is large enough and fully representative.

Eliminate any answer choices that are irrelevant to the conclusion in light of the premises. In other words, if you accept the answer choice as true but would say "so, what?" it is wrong. Also, be very careful not to pick a strengthening choice on a weaken question or a weakening choice on a strengthen question.

Cheers,

Many thanks, that's useful advice.