I'd like to add this as the most important DO: It's okay to ask about their stutter. I've had a lot of positive interactions with friends, family and co-workers who just asked about it. Why, when, how, what? It goes without saying this should be done respectfully. But I think most people with a disability appreciates when someone takes a genuine interest in understanding it and how it affects them. I've cleared up many common misconceptions because someone took the initiative to ask me about it. Most importantly, this might help you understand how you should tackle it when that person stutters. While the common *rule* is that you should never, ever, under any circumstances, finish the sentence/word of someone who stutters. Not every single stutterer might feel this way. Sometimes they might appreciate getting bailed out if they're hard stuck on a word. Only way to know is to ask.