When Calvert applied for a job at Citybikes in 1989, he found that Citybikes' owner wanted more than just an employee. The owner also wanted guidance on how to make the bicycle shop a cooperative. A year later, Citybikes became a worker-owned co-op.  The marks of a worker co-op are an emphasis on cooperative working for collective success, a democratic structure for decision making with each member having an equal vote, a collective determination of how net income or net losses are allocated, an equal contribution to and benefit from the co-op's cash and an equal sharing of the risks and benefits of working at and owning a business.  The Northwest Cooperative Association, a group that Calvert helped start and is a member of, touts economic independence, employee security and a democratic workplace as potential benefits of worker co-ops. The association holds its annual conference in October at Detroit, Oregon's Breitenbush Hot Springs, a worker-owned retreat and conference center.