Q. Market researchers often employ trained interviewers for completing the data collection part of the research design. Often tactics employed by these interviewers are subject to criticism also may seriously impact the validity of the data collected also the value of the research itself. Illustrate what do you think are the reasons behind such improper practices? Illustrate what are the various types of improper practices which have been seen to occur in field data collection? Illustrate what can the researcher do to discourage such practices?