September 28 & 29, 2020 | Virtual
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There is no "one size fits all" for a PMO maturity assessment as two PMOs can have a very different mandate.
In general you could look at metrics such as the rate of return from the organization's portfolio investments or qualitative assessment of their influence in increasing organizational project management maturity as two ways to normalize across different PMO types, but the specific practices or competencies might vary widely between high maturity PMOs based on their individual mandates.
Do you have a PMO already or not? I am guessing not because you are asking about the maturity of the organization for a PMO. You might need to start with a business case for whether or not it even makes sense to have a PMO. This will produce key information such as number or projects in the company, size of the projects, effectiveness of the projects, what methodology, processes and systems are in use, business leaders perception of the success/failure of projects, whether things can be improved with centralized project management control/assistance etc. Metrics as Kiron mentioned can be put in place to assess these factors before a PMO is created. If the PMO already exists, same deal, metrics can be agreed upon with senior management and relevant stakeholders to assess the viability/maturity of the PMO. You don't need a fancy model or complex software. Just agreed upon metrics, plot them in Excel with perhaps weighted scores, and then present them in powerpoint (as senior managers like pretty pictures) to the decision makers.
Every PMO is different so a generic tool might not be a good fit for you. I like the Gartner Maturity Model. It isn't an excel tool like you suggest but it provide a great baseline to work from to assess where you are across the board on PMO maturity.
Sorry Engels but it is a mistake into your comment. Maturity is on process not on business units. You have to evaluate the maturity of your project management (portfolio and program) maturity.
I found The PMO VALUE RING methodology
The step 6 of the methodology is based on the previous PMO Maturity Cube.
If you create your free account at the website you will be able to use the maturity model (step 6). However, before that, don’t forget to select the functions of your PMO at step 2.
Hope it help.
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