The workshop Towards Adaptive Workflow System was organized by the authors of this report as part of the 1998 Conference on Computer Supported Collaborative Work (CSCW-98), and was held at the Westin Seattle on Saturday, November 14, 1998. The workshop had about 30 attendees and included invited presentations, paper presentations/discussions and a panel. This report summarizes on the Goals and topics of the workshop, presents the major activities and summarizes some of the issues discussed during the workshop.