Competing theories

Where the literature offers more than one account, the useful work is identifying the observation that would separate them. A review that lists rival theories without saying what distinguishes them has not synthesised anything.

Where they agree

Agreement between rivals is the part of the field that can be assumed.

• Not yet written.

Where they diverge

Which this thesis adopts

And, importantly, whether the results would differ under the alternative. A thesis whose conclusions are the same under either theory has not taken a position, whatever it says it has.

Not yet written.