Like surgical scars, once promising or trendy ideas for reform have left their marks all over the D.C. school system. Many came as officials pursued the best way to configure schools for students coping with their turbulent adolescent years.

At one time or another, the city has tried schools starting with kindergarten through ninth grade and K-7; junior highs with grades seven through nine; middle schools with grades six through eight; and, most recently, schools with pre-K through eighth grade.