> Another wrong turn has been the adherence to Porter's Five Forces as a model for product strategy ... much of which has now proven useless to many enterprises

> Another wrong turn has been the adherence to Porter's Five Forces as a model for product strategy ... much of which has now proven useless to many enterprises. I'm just going to say [citation needed] here. As a former software developer, turned founder/CEO now studying an MBA to understand how to do my job better, there is a serious lack of sources here. Porter's is a good tool for understanding the landscape any business exists in, and understanding it helps software executives understand their biggest risks. For example, people say every piece of business software is competing with internal Excel spreadsheet, so how are you protecting against these substitutes? There are a lot of things in this article that illustrate its weakness, including the ad hominem attack on Porter himself ("If his model is so good, why did his business fail? Checkmate Porter!"), and seems like a self-promotion article for the authors. In fact all links to "better" models are bit.ly links that point back to the authors blog, while other links are standard long URLs.