group 1 does the first condition, group 2 does the other condition
Pros:
no order effect
less demand characteristics
Cons:
need more participants
more chance of individual differences
repeated measures
the same group of participants for each condition
Pros:
need less participants
reduced individual differences
Cons:
may get order effect
demand characteristics
matched pairs
two different groups of people who are closely matched
one group does one condition, second group does the other
Pros:
no order effects
reduces individual differences
less demand characteristics
Cons:
need more participants
order effects
the effect of doing the same task twice. the results of whichever task is completed second may be better or worse because of order effects rather than because of the IV
demand characteristics
participants may change their behaviour as they know they are being studied. may behave the way they think the researcher wants them to
counterbalancing
first group does condition 1 first, second group does condition 2 first
balances out the potential effects of doing something
