Leve et al (2010)


	Leve et al (2010)
	Advantages The size of the sample and its focus on being representative is a strength, and means it can be generalised. The researchers gathered data using a variety of methods, which means they could use triangulation to check the reliability of the data (comparing results from different methods). They collected cortisol 6 times which could increase reliability.	Disadvantages Hard to show cause-and-effect relationships between the variables as they were difficult to measure. For example, it was hard to measure attention to frustration and hard to relate to later aggressive behaviour. Inferring genetic influence from looking at birth mother and child similarities is not the same thing as using DNA to show genotype. The findings of the DNA analysis were not reported.
	Evaluation

The size of the sample and its focus on being representative is a strength, and means it can be generalised.
The researchers gathered data using a variety of methods, which means they could use triangulation to check the reliability of the data (comparing results from different methods).
They collected cortisol 6 times which could increase reliability.

Hard to show cause-and-effect relationships between the variables as they were difficult to measure.
For example, it was hard to measure attention to frustration and hard to relate to later aggressive behaviour.
Inferring genetic influence from looking at birth mother and child similarities is not the same thing as using DNA to show genotype.
The findings of the DNA analysis were not reported.

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