There are several ways to start learning about the Dynamic Maturational Model of Attachment and Adaptation (DMM), both formally and informally.

Wikipedia has a good overview article on the Dynamic Maturational Model of Attachment and Adaptation. The article is well cited and offers suggestions for introductory and advanced reading materials.
DMM Coffee House for Beginners, is a regularly occurring Coffee House Q&A series for people new to the DMM. As a part of the DMM Coffee House series, it is likewise free.
DMM Coffee House is a series of free Zoom meetings in which some advanced aspect of the DMM is explored. It is open to everyone including people new to the DMM and very experienced with it. DMM Coffee House sessions are akin to a private consultation group so privacy is promoted to foster open dialogue. Sessions are sometimes recorded for replay within future Coffee House sessions but are generally not available for public access.
DMM Group Talk is a free email listserv, and emails within the group are private to the listserv members. It is open to everyone upon disclosure of name and association to keep spammers out of the group. Click here to sign up: DMMGroupTalk@groups.io | Home.
The DMM Community (mn.co) (DMMC) is a free social media (Facebook-like and fully public) website for general DMM discussions. The DMMC hosts Zoom based interviews and publishes them on their YouTube channel. Joining the DMMC is not necessary to view information on their website, and there are no restrictions on joining.
The DMM Blog is a Conflict Science Institute blog about DMM news and events. You are welcome to write posts the for the DMM Blog, and to send us press releases about your DMM-related news and events for posting.

The University of Roehampton in London offers an Attachment Studies MSc. Online learning may be available.

The Barnard Center at the University of Washington includes the DMM in it’s attachment related courses and public training sessions.
The Cambridge Centre for Attachment conducts research and offers training and publications.
Family Relations Institute (FRI) provides regular and formal DMM training, especially for DMM attachment assessments. FRI has information about the DMM model and the DMM Circumplex, and a variety of DMM materials including a comprehensive DMM publications list, links to a number of DMM-related research articles, and a collection of videos. (Please note, most of the information on https://patcrittenden.com/ is now housed and maintained on the FRI website.)
International Association for the Study of Attachment (IASA) is a multi-disciplinary association of professionals which promotes theoretically meaningful and testable integrations of treatment methods to generate a meta-model of treatment that is systemic, developmental, transactional, and evolutionary. IASA holds conferences from time to time, supports the DMM Community (below), publishes the DMM Newsletter, established and updates the Family Court Protocol.

CSI has a number of articles describing the DMM. DMM for lawyers provides an overview of the DMM (useful for every profession). The DMM Danger list describes attachment-relevant relational-dangers which can help professionals know what dangers might be driving conflict. The Conflict Model Circumplex which is an alternate view of the DMM circumplex is helpful for clinicians and lawyers and provides a perspective which highlights the odd-even patterns in DMM theory. The information processing article discusses a central component of the DMM, including transformations of information and impacts on memory systems.
CSI has some articles about how the DMM can be applied in practice. 13 Shiny Objects is an article describing common C-strategies seen in physical and emotional cases of abuse. Gaslighting describes the original movie storyline and describes the concept in DMM terms. Shame vs. Humiliation describes these two feelings from a social science and DMM perspective. It’s Legal to Harm Children describes one way a lawyer can apply DMM theory to promote attachment-healing by parents.
CSI also offers private and firm training. Contact us to discuss how we can meet your needs.
If you have additional DMM learning resources you would like listed on this page, please contact us.