1.   Much of our existing knowledge has been gathered from descriptive studies which lack controls and proper sampling procedures.

2.   On occasions simple random sampling procedures as just described do not meet the requirements of the research.

3.   For one, the sampling procedure could be designed so that individuals are selected according to their position within the social structure or social group.

4.   Respondents are selected according to some sampling procedure to be representative of some group, collectivity, attribute or process.

5.   That survey was quite methodologically sound in that the sampling procedure was er designed so as to make it as representative as possible of the U K population.

6.   Another potential pitfall in investigating any suspected bombing, Oxley said, is the possibility of inept sampling procedures.

7.   But holding up preparations for the census is opposition to the sampling procedure from Republicans as well as some public interest groups.

8.   Critics, like professor David Freedman of the University of California at Berkeley, say the sampling procedure is fraught with problems.

9.   Grumbly said that Greenpeace would be involved in designing sampling procedures next year.