A retailer of children's toys wants to learn what customers think of the range of products they offer in its mail-order catalogue. The retailer has decided to carry out a self-completion survey of its adult customers on its catalogue mailing list but they are unsure whether the survey should be conducted by post or online.

(a) Outline the benefits and limitations of each approach which the retailer is considering for this research. Illustrate your answer with examples.

(b) The retailer has decided to use a postal survey. Outline the steps which they could take to maximise response rates. Give reasons for the suggestions you make.