e understanding of the typical cases. But the main problem of these studies is that researchers can dismiss some findings.
. Intensity sampling happens when a researcher chooses the best representatives of the field. They can be the principals of the most successful school or the most famous teachers. Some people can be skeptical about it, because it does not look like their case, but in general this sample will give deepen knowledge and understanding of the situation and maybe even inspire some followers.
. Typical case sampling involves usual people without any extremes. Usually a researcher will use this sample when a new theory or approach needs to be tested.
. Maximum variation sampling may work if a researcher wants to see how new curriculum or reforms are implemented. For this purpose he or she will need to collect data from all the possible cases, the more different they are the better. This sample can serve two purposes: to observe how the same proramme can be introduced on different levels and whether the idea of ​​new reform can be cut in different situations.
. Stratified purposeful sampling usually includes cases on three levels: average, above average and below average. This kind of sampling will give more insight understanding of the phenomena.
. Homogeneous sampling totally different from the maximum variation sampling. For the homogeneous sampling a researcher has to choose very similar cases in order to give a more detailed and deeper understanding of the case.
. Critical case sampling concentrates on one or two examples which are different from a common vision of the situation. However this kind of sampling happens mostly in sciences rather than in in education studies.
. Snowball and chain sampling happens when a researcher asks well-situated people to assist him or her cases to study. Finally a researcher may find many interesting cases to study but choose only some of them.
. Criterion sampling can involve only those participants who suit the research criteria.
. Theory-based or operational construct sampling can be done in order to prove some well-known or new theories of the real-world. For example a researcher wants to study whether Style leadership theory is true or not According to this theory a person goes through four stages during his or her work-experience and a manager has use different working methods at all these stages. In order to check it a resear...
