Pupils in several D.C. public schools will have new principals when they return to classes. The following have been approved by the Board of Education. The names of others who have not yet been approved by the board do not appear here.

Dennis Johnson, of Frank W. Ballou Senior High School, comes to D.C. from Boston, where he was principal of Dearborn Junior High School. He plans to develop "a sound competency-based cirriculum," and meet the social and educational needs of the students. The largest school in the city, Ballou will enroll about 2,600 students this year, he said.

Johnson, 40 has been principal of Grant Demonstration School in Trenton, N.J., dean of students at Medgar Evers College of the City University of New York and principal of Holy Rosary School in Pittsburgh. He taught in Philadelphia, Trenton and the Unversity of Pittsburgh.

Johnson holds a PhD in education and a masters in educations from the University of Pittsburgh, and a BS degree in physical education from Pennsylvania State University. A native of Philadelphia, he lives in Hillcrest Heights, Md.

Marie T. Foster, of Archibald H. Grimke Job Development Center, said she will encourage parental involvement and try to ensure that her pupils will "engage in activities with normal children.

Foster, 36, has been a program specialist for the emotionally disturbed in D.C. schools since August 1977. She was principal of Green Tree Lower School in Philadelphia, a private school for the emotionally disturbed and learning disabled. She holds a masters degree in education from Temple University and a BS degree in education from St. Paul's College. Originally from Lynchburg, Va., she lives in the manor Park neighborhoold in Northwest.

Stephen E. Kramer Junior High School is going back to basics, according to new principal Franklin R. Dixon.

Dixon, 46, was an assistant principal at Spingarn High School and Browne Junior high School, taught science and biology at Rabaut and Woodson junior high schools and has held teaching and school administrative positions since 1959.

He holds a masters degree in education with a major in science supervision and public school administration from the University of Virginia and a BS degree in biology from Virginia State College. Originally from Halifax County, Va., Dixon lives in Oxon Hill, Md.

Margaret G. Saxon, of W. Bruce Evans Junior High school, plans to implement a competency-based cirriculum, emphasize the team approach to teaching and incorporate instruction in math and reading in all subjects.

Saxon, a former assistant for instruction at Dunbar High School, taught business courses at Cardozo High School and in-service training courses at D.C. Teachers College, and worked as a cirriculum writer for D.C. schools.

She holds a PhD in education from Nova University, a masters in business education from New York University and a BS degree in business education from Allen University. Born in Columbia, S.C., she lives in Silver Spring.