In reply to Offwidth:
> "However, some of the items may be from existing questionnaires with known psychometric properties. ...In this case commenting on individual items is really of no value to them at all." This is a dreadful statement...
I think I understand where you're coming from here, but you do really need to know a bit more about how these scales work, why the researchers have chosen them, and what they hope to find out before you can comment. I know that comes across as patronising, but it's nonetheless true.
If each question in the questionnaire were analogous to a spanner, then I can see exactly what you mean. However, a better analogy is to see each question as a component on the circuit board of an instrument that is meant to measure X. It's perfectly reasonable (in fact a very good idea) to question whether the instrument actually measures X. However you do this, initially at least, by testing to see whether or not the instrument as a whole measures X, not by looking at individual components. If it does what it's meant to, there's no need to explore further. If it doesn't then you might have to look at separate components, but when you do this you are asking why they are preventing the instrument as a whole measuring what it is meant to.
There is a lot of well established theory around this. Wikipedia has an article on classical test theory which, at a quick glance, might give you some ideas.
I am definitely not arguing that this questionnaire, or any other that you see on here, are fit for purpose. I'm also well aware of the general shortcomings of a lot of psychological testing - I'm not trying to defend the field as a whole.
I'm also not arguing that you should never criticise individual questions. At the early stages of questionnaire development, when you are constructing your own items, it's really useful to get feedback on individual items.
What I am arguing though is that you can't just point to a questionnaire, or an individual questionnaire item without knowing what it is meant to achieve and say "that's no good". As I said before, I would never criticise without knowing much more of the background first, and this is (partly) what I do for a living.