Characteristics of a grammatical feature, type of instruction, and proficiency level of the learner all contribute to the effectiveness of various types of explicit grammar curricula. Modern curricular designs and explicit pedagogical techniques must move beyond traditional one-size-fits-all strategies. This can be accomplished in two steps. First, traditional grammar lessons can be systematically transformed by providing activities that target the unique characteristics of each morphosyntactic feature. Secondly, educators can be trained to understand grammatical features, the disparate factors that influence their acquisition, and the appropriate pedagogical techniques to deal with these disparities. Instruction that is differentiated in this way will finally give educators the insight needed to systematically "engineer" a desired result, leading to increased grammatical accuracy and proficiency.