Try to avoid the tyranny of one. Understand that there is no magic solution and that you have to use multiple methods (e.g. agile or lean or six sigma) as appropriate. In any large system, multiple methods may be used at the same time. Be mindful of ego here, tribes can form with almost religious fervour about the righteousness of their method. Have fortitude, you’ll often find you’re arguing against all these tribes at the same time.
One of the Climatic Patterns we examined in the figure 22 (chapter 3) was how no one size fits all method exists. Assuming you are removing bias in your maps either by challenging directly or with the aid of a profile built from multiple maps then the next question becomes what methods are suitable? The most common mistake that I find is with outsourcing. The issue with outsourcing isn’t that the concept is wrong but instead that we have a tendency to outsource entire systems for which we do not understand the landscape. This is often done on the hope that someone else will effectively take care of it. page 