The Same participants took part on all conditions of the experiment.
E.g. Levels of processing (all three questions were answered by all participants)
Strengths
(+) This is the best way to control differences, as each person is compared to themselfs
(+) need fewer participants
(+) intellegence and motivation will be the same
Weaknesses
(-) The order in which the two conditions are performed could influence the results - these are called ORDER EFFECTS
(-) People may find it easier to work out the aim of the study
(-) Both conditions must be similar (Tests must be well matched)
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