1Operationalise variable
to clearly state and specify how to measure variables
2extraneous variable
any varibale (other than IV that may effect the DV if it isnt controlled and dont vary systematically with IV
3confounding vriable
kind of IV varies systematically = cant tell if it effects dv
4Demand Charecteristic
Cue from the reseacher/ research situationn that may be interpreted by partticipents as revealing the aim so they alter thier behaiviour
5investigator effect
any effect of the investigators behaviour (consious/ unconsiouse) on the outcome
6Standardisation
Using the same formalised procedures
7Experimental design
refers to the way in which participents can be organisied in relation to the experrimental conditionns
8Indipendant groups
participents are allocated to different groups. each group = do one experamental condition
9Indipendant groups Pro vs Cons
Pro= no order effects and lower DC