14 November 2023 (half-day Tuesday afternoon UK time)

Previously known as: xtUML Day

Shlaer-Mellor Day 2023

What is this?

Shlaer-Mellor Day 2023 is a modeling conference and represents the 10th edition of Shlaer-Mellor Day (also xtUML Day). (See Previous Shlaer-Mellor Days.) Shlaer-Mellor Day is the premier gathering of the year of Shlaer-Mellor modelers. The Shlaer-Mellor xtUML Community meets to collaborate on Modeling, Method and Tooling.

The central topic of the conference is end-to-end modeling, execution, translation and deployment of models-as-code in mission critical settings employing rigorous methodology. The unifying theme is practical, actual, industrial application modeling within production installations. Attendees will network with engineers, scientists and educators who understand executable and translatable modeling as applied in active systems.

In 2023 continued attention is paid to extending and clarifying the Shlaer-Mellor Method in light of undocumented developments over the last several years.

Also in focus:

  • Method advances

  • Tooling Refinements

  • Incremental Adoption

  • Model Compilation

The Shlaer-Mellor Community is keen to exchange expertise and learn from one another. Shlaer-Mellor Day provides a forum for developers to share best practices and influence the direction of the technology. The conference committee hereby solicits compelling papers and presentations that exhibit method advances, tooling improvements and application experience in Shlaer-Mellor modeling and related Executable/Translatable modeling.

Conference Format and Venue

Shlaer-Mellor Day is an information dense and interactive conference lasting 4 hours. Presentations with Q&A and discussions will fill the session. Shlaer-Mellor Community members will give updates on their applications and experiences. An open moderated discussion time ends the day.

A detailed agenda will be available in October upon solidification of the presentation line-up.

Shlaer-Mellor Day 2023 will be hosted on Zoom. This platform is familiar to most and supports interaction with people as well as access to presentations.

Technical sessions are pre-recorded videos, ensuring high-density, fast-paced information transfer while allowing the speakers to interact with the audience as the video plays.


Register by emailing the co-chair (cortland.starrett at onefact.net). Provide name and company/school information. Do this even if you pay through the electronic portal.

You can pay the registration fee by clicking here. The link will take you to PayPal to purchase your ticket. Price is $100. You do not need a PayPay account to register; a credit card or debit card is acceptable.

Payment can be made by check. Other methods of payment can be arranged through the conference organizers. Discounts may be available to companies sending more than 3 participants; contact the chair.

Scholarships may be available to university students. Contact the conference committee via email.

Participants under contract with the One Fact Community Engagement support option attend at no cost.

Call for Papers (open)

If you wish to be a presenter, please submit topic, title and an abstract to the conference committee who will review and make selections. Selection is based upon perceived value to the Shlaer-Mellor Community. Presentations will need to be pre-recorded ahead of conference day.

Topics of interest to Shlaer-Mellor Day include but are not limited to the following:

  • real-world application modeling examples of installed systems

  • techniques of editing, verifying, translating, debugging and deploying models

  • methodology (Shlaer-Mellor) advances, extensions and refinements

  • static analysis of models and generated code

  • model-based model compilers

  • model integrity

  • action language dialects

  • target software architectures and translation onto those architectures

  • process integration of modeling and modeling tools

  • tooling supporting the Shlaer-Mellor Method

  • current state of the art editing, verification, translation, debugging

  • recent experience with tooling and BridgePoint in particular

  • techniques for educating modelers from young children to experienced professionals

  • tooling migration experience reports

Presentations are expected to be 10-30 minutes in duration with additional time for questions and discussion.

All submissions will be evaluated by the program committee. Selection is based upon significance, clarity and alignment with the call and value to the attendees of Shlaer-Mellor Day. Submissions that promote discussion, advance the Method and generate interaction among Shlaer-Mellor Community members are most desired. For a presentation to be accepted, at least one of the authors must register for Shlaer-Mellor Day, present the material and participate in the conference.

Important Dates

  • Title, session type and duration (estimate) submission: 9 September 2023

  • Abstract submission deadline: 16 September 2023

  • Author notification: 30 September

  • Submission deadline for video recording of presentation: 3 November 2023

  • Completion of production editing (jointly by presenter and committee) of presentation-ready version: 10 November 2023

  • Shlaer-Mellor Day conference day: 14 November 2023 1:00-5:00pm UK time

Conference Committee Contacts

  • Michael Lee, Conference Co-Chair, Model Integration, mike [at] modelint.com

  • Cortland Starrett, Conference Co-Chair, One Fact, cortland.starrett [at] onefact.net

  • John Wolfe, Conference Committee Member, Maile Technical, johnwolfe [at] mailetechnical.com

If you have questions about Shlaer-Mellor Day, contact any of the above.

Agenda of Presentations

TODO Coming Soon

In-Person Gatherings

A dinner gathering is planned in the UK in Bristol on the evening of TODO November 2023. The venue is TODO. Dinner is included in the conference registration (including a significant other).

A dinner gathering is planned in Linköping, Sweden on the evening of TODO November 2023. The venue and time are TODO.

Figure 1. Bristol, UK