— In Section 1 we define and study Schubert unions on l-step flag varieties. This has previously been done in the Grassmann case, i.e., the l = 1 case, by Hansen, Johnsen and Ranestad [7]. In Section 2 we study the algebraic codes given by mapping l-step flag varieties into projective space. This subject has also been treated in the Grassmann case previously (see p. 52). Résumé (Unions de cellu...