While there are some sampling strategies that are more commonly utilized than others, determining which strategy to use is dependent upon the intent and conditions of your project. To aid in the comprehension of the different strategies available, the following list has been sorted based on those used for qualitative research (nonprobability sampling) and those used for quantitative research (probability sampling).
Nonprobability Sampling
These strategies are not concerned with, or designed to allow for, generalization of the results to a wider population. The primary objective of nonprobability sampling is in-depth understanding of a small, narrowly defined, population.
Probability Sampling
These strategies are concerned with, and designed to allow for, generalization of the results to a wider population. The primary objective of probability sampling is a superficial understanding of a large population.
Online Resources
Determining Your Sample (Creative Research Systems)
Sampling the Evidence of Extension Program Impact (University of Florida IFAS Extension)
Further Reading
Nardi, P.M. (2003). Doing survey research: A guide to quantitative methods. Boston, MA: Allyn and Bacon.
Neuman, W. L. (2007). Basics of social research: Qualitative and quantitative approaches (2nd ed.). Boston, MA: Allyn and Bacon.
Suskie, L.A. (1996). Questionnaire survey research: What works (2nd ed.). Tallahassee, FL: Association for Institutional Research
Weathington, B.L., Cunningham, C.J.L., & Pittenger, D.J. (2010). Research Methods for the behavioral and social sciences. Hoboken, NJ: Wiley.