Given the importance of administrative attention to blended learning, this article adumbrates the institutional benefits but also the institutional challenges of this integration of online and on-campus instruction. The reasons for engaging in blended learning determine how it will play out, so the "why" is given precedence over the "how". But there is an attempt to elaborate the methods even more extensively than the reasons, to drill down into the considerations that must be taken into account in any successful implementation. Just how the details will sort out will necessarily vary from one institution to the next, but there are certain considerations that seem genuinely indispensable, the keys to success or failure, sustainability or aborted effort. (Contains 2 tables and 1 figure.)