It is very important for an enterprise to have an overarching enterprise architecture. Creating such an architecture through traditional techniques has been very expensive, time consuming, and almost always not exhibiting the following information systems plan characteristics of: timeliness, usability, maintainability, quality, and reproducibility.
To achieve these characteristics, an enterprise architecture cannot just be a large document containing a myriad of diagrams. Rather, an enterprise architecture must be an overarching layer to the overall collection of IT work products that form the implementing mechanisms for the enterprise architecture.
Because of this construction strategy, that is, bottom up and through complete integration with other IT work products, the ROI for this approach is the average of the four directly related ROI's. That is, 14.6