I use Plickers cards (magnets) to do quick assessments with my students (Grades 1-8) to see if they grasp a particular concept or skill that we are working on in class. Typically, students in grades 1 & 2 answer one question per week while grades 3-8 answer a question each day they have physical education class.

Each student has a kid code number.  Each of the Plickers magnets are numbered and attached to a magnetic dry erase board.  When it's time to do a check for understanding, I have students go to the board and I will put a question up on the projector.  The question will relate to the lesson focus of the day.

Once students view the question and are ready to answer, they rotate their Plickers magnet with the letter/answer they want at the top and then flip it over and stick it to the board so the black QR style code is facing out.  By turning the orientation of their magnet, students are able to select one of four possible answers.  

I will then use the Plickers app on my iPhone to scan the class's magnets using the phone's camera.  All the data is immediately captured and saved into the Plickers software program and we can keep that information as evidence of student learning.