The OMOP Common Data Model is managed by the OHDSI CDM Working Group. If you would like to join our group please fill out [this form](https://forms.office.com/Pages/ResponsePage.aspx?id=lAAPoyCRq0q6TOVQkCOy1ZyG6Ud_r2tKuS0HcGnqiQZUOVJFUzBFWE1aSVlLN0ozR01MUVQ4T0RGNyQlQCN0PWcu) and check "Common Data Model" to be added to our Microsoft Teams environment. This working group endeavors to maintain the OMOP CDM as a living model by soliciting and responding to requests from the community based on use cases and research purposes. For more information on the CDM refresh process please see the description [here](http://ohdsi.github.io/CommonDataModel/cdmRefreshProcess.html). You will find information on our meetings and links to join at the end of this page.
The current CDM version is [CDM v5.4](http://ohdsi.github.io/CommonDataModel/cdm54.html), depicted below. This CDM version was developed over the course of a year by considering requests that were sent via our [issues page](https://github.com/OHDSI/CommonDataModel/issues). The list of proposed changes was then shared with the community in multiple ways: through discussions at the weekly OHDSI Community calls, discussions with the OHDSI Steering Committee, and discussions with all potentially affected workgroups. The [final changes](http://ohdsi.github.io/CommonDataModel/cdm54Changes.html) were then delivered to the Community through a new R package designed to dynamically generate the DDLs and documentation for all supported SQL dialects.
The CDM working group meets the first and third Tuesday of the month. See below for links to the meetings.
**Every first Tuesday of the month at 1pm est** [Teams Meeting](https://teams.microsoft.com/l/meetup-join/19%3a133f2b94b86a41a884d4a4d160610148%40thread.tacv2/1601910741972?context=%7b%22Tid%22%3a%22a30f0094-9120-4aab-ba4c-e5509023b2d5%22%2c%22Oid%22%3a%2281c21b6d-448d-4634-abbc-6b0962d1138a%22%7d)
**Every third Tuesday of the month at 1pm est** [Teams Meeting](https://teams.microsoft.com/l/meetup-join/19%3a133f2b94b86a41a884d4a4d160610148%40thread.tacv2/1611000164347?context=%7b%22Tid%22%3a%22a30f0094-9120-4aab-ba4c-e5509023b2d5%22%2c%22Oid%22%3a%223c193b7f-c2ab-4bcf-b88c-f89a6b1fba38%22%7d)
**Note** If you do you have access to the OHDSI Teams Tenet, either contact Clair Blacketer at mblacke@its.jnj.com or fill out [this form]
(https://forms.office.com/Pages/ResponsePage.aspx?id=lAAPoyCRq0q6TOVQkCOy1ZyG6Ud_r2tKuS0HcGnqiQZUOVJFUzBFWE1aSVlLN0ozR01MUVQ4T0RGNyQlQCN0PWcu) and check "Common Data Model"
