* Watching what people do, a means of measuring the DV
+ More valid as it is a rich picture of what people actually do
+ Less risk of demand charcteristics as they may not know they are being observed
- Observer bias may be problematic
- Potentially the participants may be biased, if you have chosen to observe people in the park at 12pm these people are unlikely to be students or have a job therefore biased towards older/ unemployed people
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