Survey Research

I always recommend probability-based survey sampling techniques wherever possible.  Sometimes, however, companies and organizations want to get an initial feel for how consumers and customers will react to a new product or concept.  In addition, early in the process, you may not have the ability to comprehensively identify a target market or sampling frame, and there is no way to produce a representative sample of your population. 

In these instances, it may be useful to employ a snowball sampling technique as a pilot project, or to gain a rough, early grasp on what customers are feeling.  A snowball sample is one in which you use an initial group of respondents as recruiters for additional market research respondents.  In the survey, you ask your original respondents to list several people  they know that might be interested in completing a survey as well.   This is a case where an incentive might prove particularly useful, since you are asking your market research survey sample to provide contact information of their acquaintances.  Snowball sampling is also especially useful if you do not have a predefined list of people to survey, or if you are trying to identify key information-holders or opinion leaders.

Again, there is a significant caveat of snowball and other nonprobability-based business research methods for sampling techniques: they do not produce representative samples, and therefore cannot be used to generalize findings to the overall population.  But if you are just starting out, and do not mind that your market survey sample cannot produce generalizable findings, then a snowball sampling technique is a convenient survey data collection method to obtain larger amounts of preliminary data.