Haksoo Jeon & Daewoong Kang. 2000. Optimality Theoretic Analysis of English Word Stress. Studies in Modern Grammar 19, 139-170. This paper approaches English word stress within the framework of Optimality Theory. We have seen that there are constraints that interact to produce correct word stress pattern. Foot structure constraints, Ft-Bin, Ft-Form, and WSP, are undominated. Therefore the trochaic footing and quantity requirement are strictly obeyed in English foot building. Non-Head(e) guarantees that underlying schwa accounts for various apparent exceptions. This paper identifies four different such subcategorization constraints : Align-to-δ, Align-in-δ, Align-to-Ft, and Align-to-PrWd. What is really interesting in this approaches that one suffix may have more than one constraint, thereby restricting its appearance in actual words. One step further, this paper shows that the present approach can also explain the so-called cyclicity effect of the stress assignment. Previous cyclical stress theory fails in explaining the difference between the derived and underived word. Therefore, this paper provides new solutions to the old problem of accounting for the difference between the derived and underived words regarding the stress assignment and wellformed word formation.