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<a class="navbar-brand" href="index.html"><div><img src="ohdsi16x16.png"></img> OMOP Common Data Model </div></a>
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Background
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<a href="cdmRefreshProcess.html">CDM Refresh Process</a>
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<h1 class="title toc-ignore"><img src="ohdsi40x40.png"></img> CDM
Refresh Process</h1>
</div>
<p>The OMOP Common Data Model is managed by the OHDSI CDM Working Group.
The formal remit of the CDM Working Group (WG) is to hear proposals for
change, ratifying only those with valid use cases and data to support
them. Then, once ratified, these proposals are incorporated into the
next version of the CDM. In the past, this was done by the WG alone. The
group would invite others from around the community to present use cases
for change and suggestions for improvement. The WG would then vote on
the proposals and a new CDM version would be released after a certain
period of time or if enough proposals were voted in. This approach
worked when the community was smaller but as it is growing rapidly the
CDM WG needed to adapt the refresh cycle such that everyone has an
opportunity to weigh in on the proposed changes.</p>
<p>Looking to make a change or addition to the OMOP CDM? Please answer
the questions in the <a href="cdmDecisionTree.html">decision tree</a> to
point you in the right direction.</p>
<div id="cdm-refresh-cycle" class="section level2">
<h2>CDM Refresh Cycle</h2>
<p><img src="images/CDM_refresh_cycle.png" /></p>
<div id="define-new-version" class="section level3">
<h3>1. Define New Version</h3>
<p>The image above describes the new CDM refresh cycle. It begins with
<strong>defining a new version</strong>. Proposals are heard over the
course of a year according to the <a href="cdmRequestProcess.html">CDM
Request Process</a> and the ratified changes are added to the roadmap
until such time that there are enough updates to warrant a new version
of the model.</p>
<p>Looking to open a proposal to change or augment the CDM? Please
follow the questions in the <a href="cdmDecisionTree.html">decision
tree</a> to help you determine what you will need.</p>
</div>
<div id="sign-off-from-work-groups" class="section level3">
<h3>2. Sign off from Work Groups</h3>
<p>Each member of the CDM WG is a liaison for another workgroup in the
community. They are responsible for presenting the proposed changes to
the CDM and collecting the feedback. This has resulted in very helpful
suggestions from the EHR, Data Quality, Device, HADES, and ACHILLES
groups. This outreach has proven to be very effective and should result
in a very stable version.</p>
</div>
<div id="release-ddls" class="section level3">
<h3>3. Release DDLs</h3>
<p>After all changes and suggestions are agreed upon by the community
and work groups the next step is to generate the DDLs. For example, the
CDM WG hosted a hackathon on August 18-19, 2021. During this time the
group created an R package to automatically generate the DDLs and the
code to instantiate an empty CDM instance. Changes were made to v5.3 to
generate v5.4 and the repository was refactored.</p>
</div>
<div id="software-update" class="section level3">
<h3>4. Software Update</h3>
<p>There will be period of time once the DDLs are ready to allow the
software and methods developers to prepare for the official release of
the CDM. This is meant to serve as a buffer so that once the community
starts adopting the new model, the tools and methods will be ready to
support it.</p>
</div>
<div id="community-support" class="section level3">
<h3>5. Community Support</h3>
<p>This is the final stage of the CDM refresh cycle. Once the DDLs are
ready and the software and tools supports the new version, the CDM WG
will work to help the community convert their data to the new model.</p>
</div>
</div>
<div id="cdm-wg-meeting-information" class="section level1">
<h1>CDM WG Meeting Information</h1>
<p>The CDM working group meets the first and third Tuesday of the month.
See below for links to the meetings.</p>
<p><strong>Every first Tuesday of the month at 10am est</strong> <a
href="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">Teams
Meeting</a></p>
<p><strong>Every third Tuesday of the month at 1pm est</strong> <a
href="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">Teams
Meeting</a></p>
<p><strong>Note</strong> These were recently changed from a Skype
meeting to a Microsoft Teams meeting. If you do you have access to the
OHDSI Teams Tenet, please contact Clair Blacketer at <a
href="mailto:mblacke@its.jnj.com"
class="email">mblacke@its.jnj.com</a>.</p>
<div id="cdm-wg-important-links" class="section level3">
<h3>CDM WG Important Links</h3>
<ul>
<li><a
href="https://drive.google.com/open?id=1DaNKe6ivIAZPJeI31VJ-pzNB9wS9hDqu">Google
Drive Location</a></li>
<li><a
href="https://docs.google.com/document/d/1WgKePjrI_cGdqn2XQCe1JdGaTzdMqU4p5ihkMt8fcAc/edit?usp=sharing">Running
Agenda</a></li>
<li><a href="https://github.com/OHDSI/CommonDataModel">CDM
Github</a></li>
</ul>
</div>
</div>
</div>
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