Author: Tim Weilkiens

Nordic Systems Engineering Tour

The Nordic Systems Engineering Tour

I proudly present the Nordic Systems Engineering Tour – a one-day conference event at three different locations in three days. From Hamburg via Copenhagen to Stockholm. Together with Erik Herzog I had the idea to boost systems engineering in northern Germany, Denmark, and Sweden. Why these countries? The answer is easy: Erik lives in Sweden…
Read more

Death of the Use Case

Criminal Scene Investigation: Death of the Actor and the Use Case

The previous posts Death of the Actor and Death of the Use Case reported about two serious killings in the modeling scene. Many eyewitnesses commented the report. Now it is time for a short review. First the good news: The concepts Actor and Use Case survived the massacre. I’ve seen them still alive and very active…
Read more

List.ly: Most popular UML modeling tools

Most popular UML modeling tools

Although UML is a modeling language for software, it is sometimes also used in systems engineering projects. Since SysML is a kind of a profile you can define your own SysML stereotypes to use a UML modeling tool for SysML modeling. Please click here: http://list.ly/list/2io-popular-uml-modeling-tools  

Death of the Use Case

The Death of the Use Case

After killing the Actor in The Death of the Actor my next victim is the use case. Don’t use Use cases in SysML (or UML) models anymore! My statement seems to be revolutionary or stupid (or both). Just to be not misunderstood, I’m not against the concept of use cases and actors. I believe that the…
Read more

Trophy - Popular SysML modeling tool

Most popular SysML modeling tools

Please click here: http://list.ly/list/23A-popular-sysml-modeling-tools Unfortunately I have technical problems with the list.ly WordPress plugin and can’t show the list embedded in this blog post.

Why MBSE matters?

Many companies deal with the challenge to introduce MBSE. As a consultant for MBSE I often ask my customer about their objectives to apply MBSE techniques. The answers are more or less the same: the systems are getting more complex and at the same time we must decrease costs and time-to-market and increase the quality.…
Read more

SysML activity tree with object nodes

Hidden feature of SysML – Activity Trees

It is very well unknown and I know only a single modeling tool that explicitly supports it: the SysML activity tree. Although it is very useful and supports common systems engineering practice. What am I talking about? You may know use cases and activities to describe the use case flows. Simply spoken they describe the…
Read more

Structure of a SysML model with metadata Issues, Notes, and Sketches

Metadata in the model

Models do not only contain the “real” artifacts for your system, but also additional auxiliary information like notes, issues, images, and so on (metadata). It is very useful to store such information at the place where you need or create it. Switching from one tool to another is a hurdle that prevents people from looking…
Read more

Extended system context with SysML - FFDS example

How to model an extended system context with SysML

The extended system context describes the system interfaces and the detailed connection to the system actors and to the internal parts of the actors. In the previous post How to model a simple system context with SysML I’ve written about system context in general and the simple edition of system context that is simply spoken just…
Read more

System context Forest Fire Detection System with SysML

How to model a simple system context with SysML

The system context defines the system boundary and all system actors – humans and external systems – that interact with the system under development. It is one of the most important parts of the system model. Many artifacts of the system specification and architecture are relative defined to the definition of the system. Every system behavior…
Read more