This comprehensive examination of Arizona junior colleges covers their development, philosophy, present activities, and trends. Enrollment projections for the seven districts must allow for both normal population growth and for commuting distances in thinly populated areas. Existing and planned physical facilities and their use are described in detail. Instructional personnel is discussed by number, student load and contact hours, professional preparation, experience, and turnover. Student personnel specialists are examined according to function, organization, preparation, title, load, facilities, and difficulties. (It is noted that counseling should be continuous from freshman orientation through job placement.) Discussion of the educational program is divided into university-parallel courses; semi-professional, technical, and skill programs; joint programs; enrichment, vocational, and cultural courses; adult courses for refreshing, upgrading, and retraining; programs planned for new districts; uniformity vs. diversity; adaptations to unique local needs; feasibility of certain programs; coordination and articulation with other colleges and universities; extensions and revisions to meet manpower needs; and the over-all holding power of the college and its programs. Characteristics of the students, where they come from, where they go, and how well they succeed are described. Particulars of Arizona's junior college financing and philosophical guidelines for college boards conclude the paper. (HH)