||Cho, Hye-Sung. (2018). Bidirectional stress systems revisited. The Linguistic Association of Korea Journal, 26(4), 203-223. Bidirectional stress systems characteristically have their stress work to demarcate both edges of a word as well as to embody the rhythmic patterns within the word. Unlike unidirectional stress systems involving forming feet from either end of a word, bidirectional systems start building one foot from one edge and the remaining feet from the opposite edge. As a result, over ternary stress configurations bidirectional systems incur lapses in word-medial positions. In this paper I offer a reexamination of bidirectional systems within standard alignment theory (McCarthy & Prince 1993), but whose inherent symmetry is partially suppressed to accommodate their typological iambic-trochaic asymmetry. I contend that the interaction between asymmetrical ALIGN-WD constraints and symmetrical, foot-forming ALL-FT-L/R constraints not only makes the correct typological prediction, ruling out iambic rhythms from the bidirectional inventory but also provides an adequate account of the bidirectionalitys demarcative and rhythmic stress properties. I also argue that although they have mixed directionality orientation, bidirectional systems with a word-final three syllable stress window, such as English and Spanish be on the list of unidirectionality since they consistently maintain final lapse rather than medial lapse.