Acellus is a computer-based learning system that has changed online education as we know it today. Acellus is the only online learning system that utilizes I2 (Intelligent Interaction), the technology that enables it to cater the educational content to the individual skill set of each student through customized, personal instruction. Acellus courses are taught via tiered video instruction – each course is broken up into individual concepts, and each concept has multiple videos available. Acellus is able to customize the course to the individual pace and level of each student.