It makes an irreplaceable contribution to the development of a more rational, scientific, and socially relevant study of literature.

The area of relevant study regarded a new under water foundation procedure.

These are about finding all the relevant studies, checking for their quality and selecting only those that reach a certain standard.

Of 162 relevant studies identified, only 55 were deemed to be of 'satisfactory quality'.

While he concedes that the relevant studies of ape abilities have not yet been made, he takes this to be 'a collective acknowledgement ... that great apes would fail such tasks'.