Usually high in ecological validity because psychologists can observe real behaviour that reflects the full actions of a human being rather than small aspects of human behaviour.
An observer might make a mistake when recording the behaviour of their participants.
Psychologists might be able to record information about the way participants are behaving, but they are not able to explain why they are acting in the way that they are.
The people being watched might be aware of this and so would change the way they are behaving. this leads to lack of ecological validity, as the results will not be true refelction of their behaviour.
There may be ethical issues, such as confidentiality and right to withdraw. Protection from harm may also occour because often this research method is conducted on people with psychological problems, which means they may be vulnerable.
This research method may be time consuming as behaviours tend to be recorded over a period of time.
Usually high in ecological validity because psychologists can…