Matched pairs

• Matched Pairs design is when participants are tested on a trait .e.g. "IQ". Then participants with similar results from this test are paired up. One participant from the pair is put into "condition one" and the other into "condition two". This should be repeated until the desired number of participants in each condition is met. Each participant only completes one "condition" of the experiment
• A strength of repeated measures is that it reduces individual differences between conditions that may impact the results as the participants have been matched on ability and traits. This ensures differences in results are mostly down to IV manipulation rather than existing differences between participants. Thus increasing validity
• A weakness of matched pair design is that it is very time consuming. Testing and then matching the participants is time consuming and expensive. Thus decreasing its practicality
• A strength of independent groups is that because participants only partake in one condition, they are less likely to realise the aim of the experiment. This would prevent demand characteristics as participants will have less opportunity to change their behaviour which will lead to more accurate data. Thus increasing the validity of findings and conclusions drawn as findings are more likely to be due to the manipulation of the IV
• A strength of independent groups is that participants only take part in one condition so there will be no order effects. As a result, the participants performance will not worsen due to boredom or fatigue. As such, order effects will not impact the participants performance and affect the results so they'll be due to IV manipulation. Thus increasing the validity