Alexander Osterwalder’s post (http://businessmodelalchemist.com/2011/01/methods-for-the-business-model-generation-how-bmgen-and-custdev-fit-perfectly.html) gives the example of a fictional character, Dave, and the steps he should follow using the Business Model Canvas to start a venture selling custom-tailored shirts. In Week 3 (Industry Research) we spoke about the importance of a assessing the external environment of a business and researching trends that can affect a business. Does the Business Model Canvas include the external environment?  Based on this article can you explain how the external environment can be integrated with the Business Model Canvas?