End of 2015 I have founded the publishing platform MBSE4U for MBSE books. A few days ago I have updated my social media profiles with MBSE4U and got a lot of responses. Therefore, a few short notes to clarify things. The mission of MBSE4U is to provide books with up-to-date content about model-based systems engineering.  It is part of my authoring activities that I practice since more than 10 years. You find more details on the MBSE4U page. To avoid any...

I have just published my new book „Variant Modeling with SysML”. It presents a method for modeling variants of system requirements and system architecture artifacts with standard SysML and a standard SysML modeling tool. About 10 years ago I published the method and SysML profile for the first time. Since then I have had many discussions and experiences with that approach. Now it was time to publish a comprehensive description of the approach and to give the method a home. There are...

The association is a strange model element. And many myths about the association are going around. For example, think of all the discussions about the meaning and difference of aggregation and composition. Did you know that the concepts of aggregation and composition have not much to do with associations? I will not explain the association in detail in this blogpost. My primary intent is to get rid of the association. Ok, in some scenarios the association is necessary and useful. But...

I am happy to announce my new book about SYSMOD. SYSMOD is a MBSE toolbox for pragmatic modeling of systems. It is well-suited to be used with SysML. The book provides a set of methods with roles and outputs. Concrete guidances and examples show how to apply the methods with SysML. Today SYSMOD or more specifically customizations of SYSMOD are used in many industrial projects. Many years ago I have found the Systems Modeling Toolbox (SYSMOD) while I worked together with other MBSE experts on the...

As co-founder and a member of the organizing committee I am proud to announce another NoSE tour: For the fourth time the Nordic Systems Engineering Tour will be on tour from May 23rd to 27th. The tour is a one-day conference with four different venues. Tour speakers will present at all venues, local speakers only at a local event. Tour speakers have the opportunity to give a talk in four different countries to a large audience. The tour starts in Helsinki (23rd), then Stockholm (24th), Copenhagen (25th), and...

I am happy to announce that my brand new book Model-Based System Architecture has hit the shelves. I have written the book together with my colleague Stephan Roth and two good friends from the MBSE community Jesko Lamm and Markus Walker. We have collected a set of best practices, principles, concepts, and definitions about model-based system architecting. The book focuses on the practical application and is a good addition for a system architects toolbox. Stephan and I are both MBSE consultants...

Recently I've asked Where is SysML 1.4? Due to some formal problems it took a long time to make an official publication of the new version SysML 1.4. The work on the SysML 1.4 was completed a long time ago. Now SysML 1.4 is officially published. You find the specification on the OMG server: http://www.omg.org/spec/SysML/1.4/ . I've written a blogpost series about the changes of SysML 1.4....

Recently I have finished my blogpost series about the changes of SysML 1.4. Unfortunately SysML 1.4 is still not officially published yet. I was a member of the SysML 1.4 revision task force of the OMG that has compiled the new SysML version. We have analyzed the issues that were filed against SysML, elaborated resolutions and finally have voted for the changes. If you have any issue with SysML, you can report it here and we will consider it. We have already finished...

Well, actually it is summertime. However the weather reminds me more of autumn. At least here in Sweden. In any case it is a good time to plan and book your next training. One of my favourite projects the Nordic MBSE School provides a comprehensive MBSE program. Four course modules for you to combine to a 2, 4, 6 or 8 days training. Each course module is two days long and is conducted in central Stockholm. I will do the modules...

The Diagram Definition (DD - previously known as Diagram Interchange (DI)) is a format to exchange diagram data between tools. The data about diagrams is separated from the data about the model information. The interchange format for the model data is XMI (XML Metamodel Interchange; see XMI specification page). The following figure depicts the whole picture of the SysML Diagram Interchange architecture. As well as SysML is an extension of UML, the SysML Diagram Interchange is an extension of the UML...