2. 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

3. 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?

4. 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?

5. 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