HISEF stands for the Hamilton Invitational Science and Engineering Fair.  HISEF is the original CIF category.  This is a traditional science and engineering fair, allowing students to advance to AzSEF (Arizona Science and Engineering Fair) and eventually ISEF (International Science and Engineering Fair).  HISEF has a Senior Division for grades 9 - 12 and a Junior Division for grades 5 - 8.  Student presentations include a research plan, data, and discussion on a digital slide deck that meets the requirements for participation in AzSEF.  In addition to creating a project, students in grades 9-12 have the option of participating in interviews, providing them the opportunity to present their findings.