This paper deals with the phenomenon of Complacency which is one of the causes of human error
detected in the domain of ship accidents. The term Complacency is present as an influential social and
psychological factor which has similar cause in shipping and port commercial operations. The causes of
ship accidents from the aspect of Complacency are defined as Management Complacency, Leadership
Complacency and Self-Induced Complacency. All of these causes are reflected as causes of accidents in
ports at the management and operational level. The main domain in which Complacency is present as
influential element is decision-making process as well as in ship and port commercial operations.
