This document discusses sampling methods in mixed research. It defines mixed sampling as using two or more basic sampling methods, such as taking a random sample at one stage and a systematic sample at another stage. The document outlines several types of sampling that can be used in mixed research, including simple random sampling, cluster random sampling, stratified random sampling, systematic random sampling, and multi-stage random sampling. It provides examples of each type of sampling and discusses advantages like collecting both quantitative and qualitative data, as well as disadvantages like taking more resources and time to plan and implement mixed sampling methods.