using a control group- researcher is better able to assess whether changes in the DV were due to effect IV
experimenters may use standardised procedures
single-blind and double-blind procedure
questionnaires
validity will remain by assuring respondents that all data submitted will remain anonymous
observations
minimal intervention by the researcher
qualitative methods
qualitative methods have higher ecological validity more than quantitative, less interpretative methods of research- because the depth and detail associated with case studies and interviews is better able to reflect the pps reality
