Validity This refers to the extent to which the test measures what it claims to measure If an IQ test actually measures intelligence = valid However, many argue it is not; that it is an invalid measurement Reliability This refers to how controlled and consistent a study is A friend who is consistently late = reliable with lateness

Validity This refers to the extent to which the test measures what it claims to measure Face – does the test appear to test what it aims to test? (EG. Does IQ testing really measure intelligence?) Concurrent – does the test relate to an already existing measurement? Ecological – does the task/experiment reflect that of real life? Internal – does the test measure what is intended to or has other extraneous factors influencing? Population – Is the sample representative of the wider target population of the study Construct – does the test relate to underlying theoretical concepts? External – looks at factors outside of the study. Who is the study meant to b representative of? Can it be generalised?

Reliability This refers to how controlled and consistent a study is Inter-rater - two or more individuals have a high agreement on a score and therefore the measurement of behaviour is reliable External - the methods used to measure behaviour receive the same or similar results when replicated Internal - whether a procedure in a study can be replicated eg. Can the tools used to measure behaviour be used again?

Types of data… For each bullet point, identify the following… What the type of data is What a strength of the data is What a weakness is Qualitative Quantitative Primary Secondary