PMO - What is it?

Sooner or later as someone interested in project management you will encouter the term PMO. This article will try to explain what a PMO is and what its benefits are.
 
Most commonly PMO refers to a Project Management Office. However it can also be Program of Portfolio Management Office.
 
There are dozens of defintions for a PMO. Just Google "Define: "Project Management Office:"
 
In short:
 
 
a PMO is an office of sorts (staff or line function) dealing with project management (related things).
 
 
This may seem simple but looking at all the variations out there it is the best we can come up with.
 
A more practical approach is to look at what type of functions PMOs perform in and for organizations:
 
As with most organizational functions, not all fucntions will be perfomed by all PMOs.
 
A second way of looking at what a PMO is is to consider the level of change:
 
Please note that the above depends on the definition of project, program and portfolio. Again, there is no universal agreed defnition of these terms. This is a serious problem by the way!
 
All things considered a well implemented and organized PMO can have the following benefits:
 
See also: Project Management Office needs to allign with PM to faciliate learning , Creating a Project Management Office (PMO) Checklist,
 
Sources:
Arttoa, K., Kulvika I., Poskelab J, Turkulainena V., 2011. The integrative role of the project management office in the front
end of innovation. International Journal of Project Management 29 (2011), 408-421.
Aubry, M., Blomquist T., Hobbs, B., Müller R., 2010.  Project management offices in transition. International Journal of Project Management 28 (2010), 766-778. (One the three best-paper winners of IRNOP 2009!)
Aubry, M., Gemünden, H., Unger, B., 2011 The three roles of a project portfolio management office: Their impact on portfolio management execution and success, International Journal of Project Management 30 (2012) 608–620
Aubry, M., Hobbs, B., Thuillier, D., 2007. A new framework for understanding organisational project management through the PMO. International Journal of Project Management 25 (4), 328–336.
Aubry, M., Hobbs, B., Thuillier, D., 2008. Organisational project management: an historical approach to the study of PMOs. International Journal of Project Management 26 (1), 38–43.
Aubry, M., Hobbs, B., Thuillier, D., 2009. The contribution of the project management office to organisational performance. International Journal of Managing Projects in Business 2 (1), 141–148.
Kendall, G., Rollins, S., 2003. Advanced Project Portfolio Management and the PMO. J. Ross Publishing, Florida
Pemsel, P., Wiewiora, A., 2012, Project management office a knowledge broker in project-based organisations. International Journal of Project Management (12 pages)