Somebody pointed out this research paper to me:
https://eric.ed.gov/?id=EJ1231626
Whilst I'm personally pleased that the authors give a positive conclusion,
I can't help thinking that their methods and their reporting could have
been a lot more rigourous.
The paper doesn't seem to pose a clear hypothesis. Their survey questions
are not described except very superficially. What is most concerning, is
that they don't seem to have used a control group.
... Also they mistyped my name :( ...
I wonder if anyone is aware of any other studies on the efficacy of PSPP ?
J'