The following 22 categories and subcategories are those that will be used at ISEF 2026, Phoenix, Arizona.

ISEF Categories: Materials Science: The study of the integration of various materials forms in systems, devices, and components that rely on their unique and specific properties. It involves their synthesis and processing in the form of nanoparticles, nanofibers, and nanolayered structures, to coatings and laminates, to bulk monolithic, single-/poly-crystalline, glassy, soft/hard solid, composite, and cellular structures. It also involves measurements of various properties and characterization of the structure across length scales, in addition to multi-scale modeling and computations for process-structure and structure-property correlations.

Studies involving electrical systems in which information is conveyed via signals and waveforms for purposes of enhancing communications, control and/or sensing.

The abstract should be a brief, yet comprehensive synopsis of the research project. It should seek to highlight the research question(s), experimental procedures, data, and conclusions in a way that is concise and easy to understand. It will be reviewed by Special Award Organization and Grand Award Judges to determine whether the project stands out within its category or qualifies for special awards. The general public and other Regeneron ISEF visitors read the abstract for a quick overview of the research design and findings.

ISEF: The mission of this committee is to ensure that all competitors qualify for competition according to the rules established in conjunction with the Scientific Review Committee and Society for Science.