This is the graphics from my famous Agile in a Nutshell poster that has been downloaded over 18.000 times since October 2016. It covers both briefly the background to why we work Agile, some history and problems as well as values and principles. It also covers the difference between waterfall development and Agile in two aspects and the most common Agile practice, basic Scrum. Also I added some Lean practices to the mix to add a more advanced level to it.
On the Dandy People blog you can download the free poster in English, French, Spanish and Turkish, as well as this Power Point.