Educational aims are broad statements that guide educational policy at the national level, translating societal needs into direction for schools. Aims become more specific goals at the school or subject level. Objectives are measurable and observable student outcomes, stating what students will know or be able to do. Objectives are specific, measurable, achievable, results-focused and time-bound. Bloom's and other taxonomies provide frameworks for classifying educational objectives according to domains like cognitive, affective and psychomotor skills.