ADVANTAGES	DISADVANTAGES
INDEPENDENT GROUPS	o   There are no order effects because people only take part in one condition. o   Often the same material can be used for the task in both conditions. o   Participants cannot work out the aim of the study because they only take part in one condition.	o   There are different people (participant variables) in the two conditions so that may be why the results are different. o   You need more people for the study. To get 10 in each group you need 20 people.
REPEATED MEASURES	o   The people in both conditions are the same so there are no participant variables. o   You only need 10 people to produce 20 results because each person produces two ‘scores’.	o   There are order effects as people have to do two tasks. o   You may need two tasks (they cannot learn the same list twice). o   Participants may work out the aim of the study because they take part in both conditions.
MATCHED PAIRS	o   Participant variables are reduced. o   There are no order effects. o   Often the same material can be used for the task in both conditions.	o   Matching is difficult, time-consuming, and not always successful. o   Some participant variables are still present.