Although e-learning has improved in quality, reach and learning impact over the past decade, it can be argued that it has not yet lived up to its potential to transform workplace learning. In the drive to increase effectiveness, interest has grown in blended learning, an instructional strategy that combines the use of web-technologies with more traditional approaches, often classroom-based. This paper reports the findings of a study where two hundred managers from the same organization were randomly assigned to four research groups to complete the same course of study offered in parallel, using four different blended learning strategies. Learning outcomes and job impact were compared across the four groups to determine which blended learning strategy maximized learning outcomes and job impact. (Contains 6 tables, 1 figure, and 2 footnotes.)