The Directorate for Computer and Information Science and Engineering (CISE) invites grantees with active CISE awards to submit requests for Research Experiences for Undergraduates (REU) Supplements, following the guidelines in the REU Sites and Supplements solicitation. REU supplements help undergraduate students engage in meaningful research experiences in pursuit of their educational and career goals. CISE also invites grantees with active CISE awards to submit requests for Research Experiences for Teachers (RET) Supplements, following the guidelines in the RET in Engineering and Computer Science: Sites and Supplements solicitation. RET supplements help K-12 science, technology, engineering, and mathematics (STEM) teachers engage in meaningful research experiences and translate the knowledge gained into their teaching practices. Requests will be considered as they are received. CISE strongly encourages the submission of requests before March 31st, each year; as the potential for funding requests after this date may be limited.