Linkenbach and Perkins (smoking in adolescents), Schultz (hotel guests), Nolan (neighbours).
strengths of NSI
Research support, NSI shaping behaviour through normative beliefs, people thus shape behaviour to fit with reference group.
limitations of NSI
Possibility of oversimplistic explanation, people do not recognise behaviour of others as a factor in their own, thus underestimating the impact of normative influence.
Strengths of ISI
Demonstrates support that exposure to other beliefs/info shapes aspects of social behaviour - shifts of judgement.