When teachers log in to the Socratic iPad app, they are given several choices. They can begin a quiz that was precreated, ask an exit slip question, or choose to ask questions verbally and have kids answer in multiple choice, true /false, or short answer formats. The teacher is then given a classroom number.
Students go to www.socratic.com and use the teacher's classroom number to sign in and answer questions.
The best part about the whole system is that you can get immediate feedback on short answer responses, which questions your students are getting right, the number of kids who picked each answer choice, etc. depending on which type of quiz you choose to give.
I personally can't wait until next year when all of my students are 1:1 and I can truly put this tool to the test. It will provide an easy solution to that ongoing problem of gathering data to drive my instruction.