The implication of incentive of social approval and group norm;

Social approval motivation is often neglected in mainstream economics; while Alkerlof s theoretic analysis indicates this motivation has important incentive implication.

In order to successfully pass the survey on the communication & navigation instruments for the ships registered in the foreign classification societies, it puts forward some relative attentions and methods for references.

For the recent century, with the rapid development of classification societies, they strengthen the technical powers, enrich the inspection experiences, widen the service scope and accordingly improve the financial solvency.