This paper discusses a "language lab" strategy in which traditional studio learning may be supplemented by language lessons using computer graphics techniques to teach architectural grammar, a body of elements and principles that govern the design of buildings belonging to a particular architectural theory or style. Two methods of teaching Frank Lloyd Wright's Usonian grammar to architecture students are described, the manual method and a manual transformation exercise involving the comparison of architectural plans to identify variant and invariant aspects, and it is concluded that both methods yield partial success and partial failure. A computerized synthesis of the two methods, the Architectural Grammars software (AGS), is suggested as a drawing medium. A discussion of AGS describes its use of module-tree templates, set operators, and scripted data structures in five exercises: (1) control-animation, which presents drawing sequences in semi-animated form; (2) variant-animation, which allows a detailed investigation of plan variations; (3) continuous-drawing, which promotes a natural design discourse; (4) continuous-design, which facilitates fast, unself-conscious design decisions; and (5) design-animation, which allows students to reconstruct their own solutions as animations that can be compared directly with the prototype. The text is supplemented with 10 plates. (KM)