Opportunity sampling - choosing participants based on convenience of whoever is available, volunteer sampling - participants are self selecting, random sampling - all participants have equal chance of being chosen, stratified sampling - Subgroups within a population are represented proportionally in the sample, Systematic sampling - when a system is used to choose participants such as every 10th student from a sample of 500, advantage and disadvantage of opportunity - quick and easy in comparison to random but will not be representative, similar types of participants will be chosen, , advantage and disadvantage of volunteer - may be the only way to get participants when unusual behaviour or circumstances are being studied, will not be representative, advantage and disadvantage of random - more representative, it is a time consuming method and those picked may not be willing to take part, advantage and disadvantage of systematic - it is free from reseacher bias, sample chosen may not be representative, every nth person may share a common trait, advantage and disadvantage of stratified - free from researcher bias, those in the subgroups may not be completely representative of that subgroupbe ,

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