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We conducted surveys with 277 participants, interviews with 40 individuals, a one-month calendar adoption intervention with 30 couples, and a design workshop with 12 couples. Our findings reveal persistent obstacles-including privacy concerns, uneven engagement, and limited customization-as well as the potential of targeted support and user-driven design to overcome them. Participants expressed a desire for more flexible privacy controls, role-sensitive features, and smarter coordination support. Thematic analysis across all phases highlights how families negotiate boundaries, share invisible scheduling labor, and creatively adapt tools to fit their routines. We conclude with implications for designing family-centric coordination technologies that balance structure, agency, and trust in everyday scheduling.<\/jats:p>","DOI":"10.1145\/3757584","type":"journal-article","created":{"date-parts":[[2025,10,16]],"date-time":"2025-10-16T17:32:00Z","timestamp":1760635920000},"page":"1-27","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Double Incomes, Single Calendar: Reimagining Shared Scheduling for Modern Families"],"prefix":"10.1145","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8438-8297","authenticated-orcid":false,"given":"Zhao","family":"Zhao","sequence":"first","affiliation":[{"name":"School of Computer Science, University of Guelph, Guelph, ON, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2025,10,16]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"Employment Characteristics of Families Summary - 2023 A01 Results. 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