This document discusses various sampling techniques for quantitative research. It describes probability sampling methods like simple random sampling, stratified random sampling, systematic sampling, cluster sampling, and multi-stage sampling. These allow each unit in the population to have a known chance of being selected. Non-probability methods like quota sampling, purposive sampling, snowball sampling, self-selecting sampling, and convenience sampling are also covered. The key steps in sampling, such as defining the population, establishing a sampling frame, determining sample size, and selecting the sample are also outlined.