According to Benjamin Bloom's (1981) concept of of mastery learning, most students--given the appropriate instruction and learning resources, adequate time spent learning, and perseverance--can learn a particular academic skill. Because a classroom often does not provide enough time or resources for developmental students to master necessary basic skills, the Dekalb (Georgia) Community College South Campus (DCC-S) learning center offers services essential to helping students achieve mastery learning in the areas of English grammar and composition, math, reading, and study skills. The preconditions it has established are that the classroom instructor, learning center staff, and students must comprehend what tasks are to be learned, what procedures are to be followed, and what evaluative instruments are to be used. Among the instructional services it offers are one-to-one tutorials by knowledgeable persons and a variety of resource materials in different instructional modes, including videotapes, audiocassettes, and programed and unprogramed texts. Additional instructional services include minicourses, independent study sections, and individualized class sections. DCC-S also employs frequent evaluative testing and retesting to pace and motivate students. The learning center is also accessible in terms of location and hours to enable students to devote adequate time to their learning. Finally, perseverance by the students is encouraged by the tutors' eagerness to help and by the students being able to repeat tests and show visible progress toward mastery. (CRH)