This NYC tipping guide is taken from the research of Waitbutwhy.com, original available here http://waitbutwhy.com/2014/04/everything-dont-know-tipping.html. I used the chart to start a discussion with my students about societal/personal obligations to tip. Students used the examples to practice explaining what the research found (e.g. you must tip at least 17% to waiters, but don´t have to tip or you can tip a little to baristas from coffee shops and workers from take out orders). Then we compared the tipping culture and requirements to local culture (in my case, Chile) and talked about the personal and business requirements here. Could also be used to practice comparisons, superlatives and business English. Enjoy!