Organic or Simple – Flexible working arrangement with people working side-by-side. Start up like atmosphere. Flat organization structure. PM has little to no authority.
Functional – A hierarchical organization where each employee has one clear superior. Staff are grouped by areas of specialization and managed by a person with expertise in that area aka the functional manager. PM has little to no authority.
Weak Matrix – Matrix that more closely resembles a functional organization. Many times coordinators or expeditors are used instead of project managers. When PM role is resent, PM has little authority.
Matrix / Balanced Matrix –The project manager shares responsibility with the functional managers for assigning priorities and for directing the work of persons assigned to the project. PM has same authority as of functional manager. Decisions are taken together by PM and functional manager.
Strong Matrix – Matrix that more closely resembles a projectized organization. Here PM has greater authority then that of functional manager.
Project-oriented – Team members grouped by projects. PM has a full time designated role, dedicated full time resources and high authority.
Virtual Organization – Teams are connected by work points or nodes, mostly via internet with other members. PM typically has low to moderate authority, with a full or part-time role.
Multi-divisional – A structure that lacks centralization and the PM has little to no authority. There may not even be a defined PM role.
Hybrid – A mix of various types of structures where the PM authority and role varies by the combination.