The paper investigates the effectiveness and efficiency of social services, as well as terms and questions related to them, regarding their role in service organization. At first it makes an attempt to clear up some words with similar meaning, including ones based on quality and outcome. Then it reviews the historical roots concerning efficiency and effectiveness, followed by researches took place in social work particularly, covering the related terms, the trend called managerialism, then the quality management, witch originates from it, and the evidence based practice. Next, the topic related fundamental indicators are presented, according to the measurability of social work, naming some indicators it could measured with while evaluating. Toward the end the relation between service planning/organizing and efficiency/effectiveness, and the relevant terms considering this relation are discussed.