> In sum: “Small differences between lessons plans are enormously important, enormously time-consuming to account for and fix, and whatever I already have is probably good enough.” It turns out that even if two lesson plans don’t differ all that much they already too much. [source](http://blog.mrmeyer.com/2016/why-secondary-teachers-dont-want-a-github-for-lesson-plans/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+dydan1+%28dy%2Fdan+posts+%2B+lessons%29)