determinism is all about causation
must show behaviour has been caused by something else thats not within persons control
to do this use scientific method
use empirical methods so theres control - lab exp/brain scans
all evs controlled so iv only thing affecting dv
can establish cause & effect relationship between iv & dv
first construct theory
generate hypothesis around this theory
test hypothesis carrying out empirical methods
if theres significant effect can be argued theres causal relationship so can say that thing CAUSED our behaviour