Case study: RLadies relationship
RLadies is an organization that "promotes gender diversity in the R community and in data science more broadly" (website). In additional to a community Slack, they hold monthly meetups, and collaborations with other organizations.
Marieke Jackson, who was leading a Code for Philly project with Prevention Point, met Karla Fettich at an RLadies meetup. Karla was an RLadies organizer and volunteer at Philadelphia Animal Welfare Society (PAWS).
Eventually, Marieke heard about Karla's work at PAWS and wondered whether it was a good fit for Code for Philly. At this point, she had joined Code for Philly's leadership team. She and Michael Chow--projects co-lead at the time--set up a quick initial meeting, and scheduled PAWS to present at a hacknight!