Systems theory is antireductionist; it asserts that no system can be adequately understood or totally explained once it has been broken down into its component parts. (For example, the central nervous system carries out thought processes would not occur if only parts were used.)
Does a social worker have an obligation to preserve confidentiality if an HIV positive client refuses to inform his/ her sexual partner of the infection (while persisting in behavior that puts the person at risk), or does the social worker have an obligation to warn the partner of the peril?
The social action approach, assumes there is a disadvantaged (often oppressed) segment of the population that needs to be organized, perhaps in alliance with others, in order to pressure the power structure for increased resources or for treatment more in accordance with democracy or social justice.