One advantage of opportunity sampling is that it is very quick and easy to use because the researcher selects the first available participants who meet the criteria. This saves time and effort compared to other methods, making it practical for studies with limited resources. However, a disadvantage is that opportunity sampling is likely to be biased since the sample only includes people who happen to be available at certain place and time. For example, if participants are chosen from the shopping centre on a Monday morning, certain groups like professionals or rural residents may be excluded, reducing the sample’s representativeness and limiting the generalisability of the findings.
