assessment. Psychological service assessment may be defined as evaluation of the impact of a disaster at a particular time on individuals, families and communities, with the purpose of determining needs for psychological service interventions. Assessment is a continuing process from pre-impact to healing. It is a complex, dynamic multidimensional inquiry which takes into account adaptive and maladaptive biological, psychological and social responses to threats of survival and to what is cherished in life. community. A group with a commonality of association and generally defined by location, shared experience or function.