Reliable
If we repeat the study again we will get the same results
Operationalisation
Define the key variables and state how you will measure it
Demand Characteristics
Participants guess the aim of study and alter their behaviour accordingly
Mundane realism
To what degree is the task in a study reflective of reality and everyday situations
Valid
Does the study measure what it set out to in the aim
Ecological validity
The ability to generalise the findings of a piece of research to real life situations or other places/contexts