In response to an unknown trigger, the immune system may begin producing antibodies that instead of fighting infections, attack the body's own tissues. Treatment for autoimmune diseases generally focuses on reducing immune system activity.
What's taught in school. Some of the items in standardized achievement tests measure the knowledge or skills that students learn in school. In certain subject areas, such as mathematics, children learn in school most of what they know about a subject.
achievement test. 1. a test designed to measure the knowledge or proficiency of an individual in something that has been learned or taught, as arithmetic or typing. Compare intelligence test. Prior to kindergarten, the children participating all took some variety of intelligence test or achievement test.