In their attempts to help educators improve student achievement, researchers have identified hundreds of effective school practices. However, there is no accurate picture of the relative effectiveness of effective practices or the ways various practices interact to produce results. Nevertheless, the data are plentiful enough to permit informed interpretation about the most beneficial schooling practices. This booklet draws on the general database of effective education practices to identify what appear to be the core contextual and instructional factors, or attributes, that enable students to learn successfully. The areas of research identified in this booklet rest on considerable research weight, are entirely or partially school controllable, and can be implemented without significant new expenditures. Fifteen effective-schooling attributes are identified here and grouped under two headings. Under the heading "Contextual Attributes" are the following: safe and orderly school environment; strong administrative leadership; primary focus on learning; maximizing learning time; monitoring student progress; academically heterogeneous class assignments; flexible in-class grouping; small class size; supportive classroom climate; parent and community involvement. Under the heading "Instructional Attributes" are the following: careful orientation to lessons; clear and focused instruction; effective questioning techniques; feedback and reinforcement; review/reteaching as needed. (Contains footnotes and 190 references.) (WFA)