As the great architect Louis Sullivan said, "Form ever follows function." So for me the question is, "What is the best structure for facilitating learning that will result in achieving business goals?" That necessitates what Sean Murray and I call the "5As Framework": 1) alignment of learning interventions (training, coaching, online support, etc.) with goals; 2) anticipating success; 3) learning alliance of learner with supervisor/boss; 4) application of learning to achieve business goals; and 5) accountability for business results. Whatever structure (centralized training department; distributed training department; collaborative networks; etc.) supports these elements, that is what is needed.