For each of the following research questions it has not been possible for you to obtain a sampling frame. Suggest the most suitable non-probability sampling technique to obtain the necessary data, giving reasons for your choice.

a What support do people sleeping rough believe they require from social services?

b Which television advertisements do people remember watching last weekend?

c How do employers’ opinions vary regarding the impact of European Union legislation on age discrimination?

d How are manufacturing companies planning to respond to the introduction of road tolls?

e Would users of the squash club be prepared to pay a 10 per cent increase in subscriptions to help fund two extra courts (answer needed by tomorrow morning!)?