By far the most voluminous series is the Project Files which comprise approximately 32 meters of textual records and 5,200 drawings and plans relating to all phases of conception, design, tendering, and construction of Wien's work from 1958-1990. The projects range from small repairs, renovations, and additions, to heritage restorations, to large public buildings and commercial complexes, and include schools, churches, office buildings, stores, warehouses, picnic shelters and campsites, monuments, markers, and roadside signs, houses and apartments, hotels and motels. Proposals for projects that were never built have also been retained. Arranged chronologically by project number, the files contain feasibility studies, requirements, proposals, contracts, tenders, change orders and change memos, test reports, drawings and plans, presentation boards, revisions, approvals, meeting minutes and notes, specifications, quotations and cost estimates, progress reports and invoices, transmittal forms, furniture lists, schedules, inspection reports, shop drawings, photographs, models, colour schemes, recommendations and observations, interior designs, consultants' reports, field instructions, correspondence with clients and contractors, and other documents. Oversize architectural plans have been removed from the project files and stored separately in map cabinets. This series includes ca. 120 presentation panels and seven architectural models.