ETHICAL ISSUES: when conducting research with children under 16 psychologists must obtain consent from the adult responsible for that child.
THE SAMPLE: Participants of various ages were used (inlike Rose and Blanks) so the researchers can note how conservational skills develop with age. The sample was large and likely to be generalisable to a wider population. However, it could be that in different countries the education system for children indifferent sso we should exercise caution in generalising the findings beyond Western Europe.
THE RESEARCH METHOD: Lab experiments make it possible to compare the different ages so we are able to demonstrate a cause and effect relationship. Lab experiments also make it possible to eliminate extraneuos variables, raising the validity. However demand characteristics may have effected the way the children (particularly the younger, less confident ones) may have behaved in the study. The study also lacked ecological validity, the task may have been unfamiliar to the children and so not a true reflection of their cognetive skills.
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