This is the PKI Maturity Model of the PKI Consortium, the current version is located at https://pkic.org/pkimm.
View the PKI Maturity Model on GitHub
We encourage everyone (including non-members) to make contributions to our PKI Maturity Model, all contributions are subject to our Intellectual Property Rights Agreement.
You can view the charter of the working group at: https://pkic.org/wg/pkimm/charter/