+ More richness and detail → more internal validity - Harder to analyse : does not lend itself to being summarised statistically so that patterns and comparisons can be drawn .
Subjective interpretation of researcher
Quantitative : numerically +Objective less subject to bias → easier to analyse and draw conclusion -Narrower scope and meaning : not representative of real life
Primary data : directly from ppts collected first hand → specifically relate to aims
Secondary: third party → pre-existing not specific to research