3SL on Social Media

Keeping In Touch

You can reach 3SL in a number of ways on social media. We want it to be as easy as possible to contact 3SL on social media, so we have a number of ways you can follow and stay up to date with what’s going on. These social media sites compliment the direct contact available through website blog and webinarsemail and phone for direct communication.


Our company page on Linked in is 3SL. To follow Requirements Mangement and Systems Engineering discussions along with more in depth 3SL or Cradle articles Join the “Cradle -RM/SE Tool from 3SL group.

Screenshot of https://www.linkedin.com/company/3sl


Follow @threesl on Twitter for hints tips and daily news.

screenshot of www.twitter.com/threesl


If you want to keep up to date via Facebook, we’re 3slcradle.

screenshot of www.facebook.com/3slcradle/


You can view our 3SL Cradle instructional videos on our YouTube Channel.

screenshot of 3SL youtube channel
3SL Cradle YouTube


If you follow engineering topics in one of the Google+ communities, you can reach us via +3SLCradle.

screenshot of plus.google.com/+3SLCradle


Want to chat or mention us? Please use #3SL for the company and #Cradle for product references. Mentioning #MBSE,  #Requirements, #SysML #SystemsEngineering will also help like-minded engineers find your articles. Search for more terms at hashtagify.me

3SL/Cradle Videos – Subscribe and Request

Extra Videos

We want to increase the number of videos in our YouTube channel and we need your help. So please:

  1. Subscribe to the channel!
  2. Tell us what types of video would be most helpful, for example:
    • General demos of capabilities, such as traceability, using trees, view, or reviewing items
    • Demos of individual operations, such as capturing source documents or creating a query
    • Building a Cradle schema
    • Or something else!
  3. Tell us your preferred maximum length for a video, for example < 10, 5 or 2 minutes
  4. If English is not your first language:
    • Do you prefer a human voice or a computer-generated voice?
    • Is it helpful to also show text notes inside the video?

If you know some topics that you want to see in a video, tell us what they are!
Thank you for any help that you can provide, either as comments on this discussion, or by e-mails to me at: mark.walker@threesl.com

Screenshot of 3SL YouTube channel
3SL YouTube channel

Cradle-7.1 – SysML Videos

Our 3SL colleagues in the US have posted a series of videos demonstrating the SysML support in Cradle-7.1. This is a single demonstration, split into a series of parts:

You can access these demonstration videos here:


Please look at these videos and see how SysML models can be built in Cradle and how these models can be integrated into other information, including requirements, tests, test cases, defects, issues and risks.

At 3SL we believe that MBSE is the ideal approach (whichever notations you choose to use) but only if it is integrated into all of the other information in your project.

MBSE in isolation is just a bunch of pretty pictures!