The Engineer-it Kit comes in Single User or Group User. It contains the same ingredients, in different quantities to allow the "Single" user the chance to engineer the bacteria twice, and the group to engineer 16 times (perfect for a class of 32 divided in groups of 2). The Individual Kit: The Engineer-it Kit "Individual" or "single" allows for 2 attempts at engineering bacteria with DNA Program provided. Try both simultaneously to maximize your chance of success, alone or with a friend. In the 2017 kits, you will find 4 petri plates in your kit. This means you can now try both attempts at once or keep one attempt for later, as a repeat experience.The Group Kit: The Engineer-it Kit for groups allows for 16 attempts at engineering bacteria with a DNA Program. In a group of 16-32, we recommend pairing up the students. If 16 or less users are present, you can save up the ingredients for later use. The manuals contain the breakdown of the group kit per student.