Lenny Delligatti


Lenny earned his B.S. degree in Electrical and Computer Engineering from Carnegie Mellon University and his M.S. degree in Computer Science Systems Engineering from the University of Denver. He holds the OMG Certified Systems Modeling Professional (OCSMP) Model Builder: Advanced certification, the highest level of certification in SysML and Model-Based Systems Engineering (MBSE) methodology. Additionally, he holds the OMG Certified UML Professional (OCUP): Advanced certification, the highest level of certification in UML. Prior to founding Delligatti Associates, Lenny was a Senior Systems Engineer with Lockheed Martin, creating SysML models and serving as the MBSE lead for NASA’s Mission Control Center: 21st Century (MCC-21) project at Johnson Space Center in Houston, Texas. He previously served as an embedded software engineer on NASA’s Aircraft Simulation Program (ASP), building VxWorks kernels and developing flight software for NASA’s fleet of Gulfstream II in-flight Space Shuttle simulators. He also served as a software engineer on the Nomad project at Carnegie Mellon University’s Field Robotics Center, designing and developing the Sensor Manager subsystem for the Nomad Autonomous Rover. Lenny is an active member of the Object Management Group (OMG) SysML Revision Task Force (RTF), the OMG UML RTF, and the OMG OCUP2 Certification Development Team. He serves also as the Education & Outreach Director for the Texas Gulf Coast Chapter (TGCC) of the International Council on Systems Engineering (INCOSE), supporting the professional development of the Houston-area systems engineering community. In addition to his engineering experience, Lenny served as a Surface Warfare Officer in the United States Navy, completing a deployment in support of Operation: Enduring Freedom and two tours of duty in Sasebo, Japan and Norfolk, Virginia. Following his Navy service, he received formal training in pedagogy at Old Dominion University and earned a license to teach mathematics in the State of Virginia. He served as a mathematics teacher and department head in the Fairfax County Public Schools system before transitioning back into the engineering profession upon his move to Houston, Texas. Lenny is passionate about engineering and helping engineers develop more effective ways to do engineering. He has created and delivered hundreds of hours of classroom instruction to hundreds of systems and software engineers on the topics of UML, SysML, and MBSE, enabling many to earn OMG certifications and lead MBSE efforts on their projects. He has delivered SysML and MBSE presentations at INCOSE meetings and at American Institute of Aeronautics and Astronautics (AIAA) Technical Symposia at Johnson Space Center. Lenny is the author of the book SysML Distilled: A Brief Guide to the Systems Modeling Language, published by Addison-Wesley in 2013. Read Lenny’s blog post, “SysML Distilled. The Origin Story,” to learn how it all started.

Mar 192015

MBSE RIOLenny Delligatti, the author of SysML Distilled, presents this 26-minute on-demand webinar discussing MBSE ROI. He presents data collected from four aerospace and defense programs. These data provide evidence that there is a higher probability that MBSE will result in a better outcome than the traditional document-based approach.

Two roots of MBSE ROI are presented:

•  Automated consistency among work products when a change occurs
•  Rapid, definitive answers to stakeholders’ questions

Lenny demonstrates both of them in an actual system model.

These are the benefits of adopting and practicing Model-Based Systems Engineering (MBSE). These benefits enable engineering organizations to achieve their primary goal: improved affordability and product quality.

If your team is currently practicing the traditional, document-based approach to engineering, then you have experienced the burden and cost of manually maintaining a disjoint set of work products (i.e., documents, spreadsheets, diagrams, reports, and presentations).  Learn how your organization could use MBSE to navigate the rigors of an effective engineering process to realize the joy of designing great products, delivered on time and within budget.

Please follow a link to this on-demand webinar:


Please note that you can download a PDF copy of the PowerPoint presentation from the “Files” pod in the upper-right corner of the window after you start the on-demand webinar. The PowerPoint file contains links to many free resources to help you get started with MBSE.


Jul 222014
SysML DistilledSysML Distilled: A Brief Guide to the Systems Modeling Language
The Systems Modeling Language (SysML) extends UML with powerful systems engineering capabilities for modeling a wider spectrum of systems and capturing all aspects of a system’s design. SysML Distilled is the first clear, concise guide for everyone who wants to start creating effective SysML models.

Drawing on his pioneering experience at Lockheed Martin and NASA, Lenny Delligatti illuminates SysML’s core components and provides practical advice to help you create good models and good designs. Delligatti begins with an easy-to-understand overview of Model-Based Systems Engineering (MBSE) and an explanation of how SysML enables effective system specification, analysis, design, optimization, verification, and validation. Next, he shows how to use all nine types of SysML diagrams, even if you have no previous experience with modeling languages. A case study running through the text demonstrates the use of SysML in modeling a complex, real-world sociotechnical system.

Modeled after Martin Fowler’s classic UML Distilled, Delligatti’s indispensable guide quickly teaches you what you need to know to get started and helps you deepen your knowledge incrementally as the need arises. Like SysML itself, the book is method independent and is designed to support whatever processes, procedures, and tools you already use.

Coverage Includes

  • Why SysML was created and the business case for using it
  • Quickly putting SysML to practical use
  • What to know before you start a SysML modeling project
  • Essential concepts that apply to all SysML diagrams
  • SysML diagram elements and relationships
  • Diagramming block definitions, internal structures, use cases, activities, interactions, state machines, constraints, requirements, and packages
  • Using allocations to define mappings among elements across a model
  • SysML notation tables, version changes, and sources for more information

Download a free sample chapter, “Chapter 3: Block Definition Diagrams” from SysML Distilled: A Brief Guide to the Systems Modeling Language.