Systems theory is antireductionist; it asserts that no system can be adequately understood or totally explained once it has been broken down into its… - Charles Zastrow

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.

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?

In the past several years, social work has increasingly focused on an . This model integrates both treatment and reform by conceptualizing and emphasizing the dysfunctional transactions between people and their physical and social environments. Human beings are viewed as developing and adapting through transactions with all elements of their environments. An ecological model gives attention to both internal and external factors. It does not view people as passive reactors to their environments but, rather, as being involved in dynamic and reciprocal interactions with them.