**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** THE E-HEROS STUDY (ELECTRONIC HEALTHY ENVIRONMENTS STUDY) IS AN INTEGRATED RESEARCH, EXTENSION, AND EDUCATION PROJECT TARGETING FAMILIES OF PRESCHOOLERS VIA A DIGITAL HEALTH INTERVENTION TO PROMOTE HEALTHY EATING AND ACTIVITY BEHAVIORS AND ENVIRONMENTS (AND ULTIMATELY WEIGHT OUTCOMES). BUILDING UPON OUR CURRENT HEROS STUDY (DELIVERED FACE-TO-FACE), THE PROPOSED PROJECT SEEKS TO PROVIDE TESTED, EVIDENCE-BASED PROGRAMMING TO FAMILIES VIA A MOBILE APPLICATION, ALLOWING FOR ENHANCED ACCESSIBILITY AND FLEXIBILITY FOR PARTICIPANTS AND THE POTENTIAL FOR INCREASED SCALABILITY. WE WILL ENGAGE TARGET AUDIENCES THROUGHOUT THE DEVELOPMENT OF THE E-HEROS APP TO ASSESS ACCEPTABILITY, USABILITY, FEASIBILITY, AND EFFECTIVENESS. WE WILL TARGET FAMILIES WITH LIMITED RESOURCES LIVING IN RURAL COLORADO, WHO HAVE THE HIGHEST RISK OF OBESITY AND HEALTH DISPARITIES. IN A QUASI-EXPERIMENTAL CONTROLLED DESIGN, THE ADOPTION AND EFFICACY OF THE E-HEROS INTERVENTION (TREATMENT) WILL BE COMPARED TO A DELAYED INTERVENTION GROUP (CONTROL) TO DETERMINE EFFECTS ON: 1) PARENT SELF-EFFICACY, BEHAVIORAL CAPABILITY, AND FEEDING AND ACTIVITY PARENTING PRACTICES; 2) CHILDREN'S EATING BEHAVIORS; 3) CHILDREN'S PHYSICAL ACTIVITY; AND 4) THE HOME ENVIRONMENT. AN ONLINE EDUCATIONAL COURSE WILL BE DEVELOPED AND WILL INTEGRATE CHILD DEVELOPMENT, NUTRITION, AND PHYSICAL ACTIVITY TOPICS TO COMPLEMENT EXISTING COURSEWORK AND PROFESSIONAL DEVELOPMENT OFFERINGS FOR STUDENTS, EARLY CHILDHOOD EDUCATORS, HEALTH PRACTITIONERS, AND COMMUNITY EDUCATORS. EXTENSION AGENTS AND COMMUNITY STAKEHOLDERS WILL BE INSTRUMENTAL IN THE DEVELOPMENT AND DISSEMINATION OF THE E-HEROS INTERVENTION AND ONLINE COURSE. THE PROJECT'S LONG-TERM GOAL IS CONSISTENT WITH USDA'S GOAL OF IMPROVING THE NATION'S NUTRITION AND HEALTH BY PROMOTING HEALTHY EATING AND ACTIVITY BEHAVIORS IN YOUNG CHILDREN.