Though my expertise lies in health and wellness rather than co-parenting systems, I can speak to the importance of clear, consistent communication for any successful relationship. In my personal experience, a simple shared digital calendar, like Google Calendar, has been a lifesaver for family scheduling around my husband's work and our children's many activities. We color-code entries for each person, so at a glance, we know who is where and when, minimizing miscommunications and stress.