Research round-up

A critical review of the Delphi technique

Ruth Beretta

Experiences with a volunteer sample

Kate Sullivan

A sampling strategy for qualitative research

Jan Reed, Susan Procter, Sarah Murray

The effect of statistical sampling error on reliability and validity

Bunny le Roux

Calculations to determine sample size

Valeric Hillier, Alan Gibbs

The reliability and validity of samples

Robert Newell

A discussion of different types of sampling techniques

Jonathan Blacktop

Editorial

Dr Jacqueline Oldham