System Safety Pro

Monday, August 11, 2025

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Who is the Safety Artisan? Find out here.

Simon Di Nucci https://www.safetyartisan.com/connect/

Sunday, August 10, 2025

Courses
Here are some of the courses that you can buy from The Safety Artisan – follow the Udemy Course Links.

Stand-Alone Courses

How to Design a System Safety Program

https://www.udemy.com/course/system-safety-risk-analysis-programs/?referralCode=38B31C7BDD4DED49E44E

System Safety Engineering Process

https://www.udemy.com/course/system-safety-engineering-process/?referralCode=AA799BF5235D13D868D5

Principles of Software Safety Standards

https://www.udemy.com/course/principles-of-safe-software-design/?referralCode=25398951621CFC5B8471

System Safety Engineering Courses

How to: Preliminary Hazard Identification (Mil-Std-882E)

https://www.udemy.com/course/how-to-preliminary-hazard-identification-mil-std-882e/?referralCode=F681CF650D3BDDAD307B

How to: Preliminary Hazard Analysis (Mil-Std-882E)

https://www.udemy.com/course/draft/6187483/?referralCode=1A153CA582E27235304D

How: System Requirements Hazard Analysis with Mil-Std-882E

https://www.udemy.com/course/how-system-requirements-hazard-analysis-with-mil-std-882e/?referralCode=919C1FCE9C325351BA24

How To: Sub-System Hazard Analysis (per Standard)

https://www.udemy.com/course/how-to-sub-system-hazard-analysis-with-mil-std-882e/?referralCode=D014CFEB810BD288A741

How to do System Hazard Analysis (per Standard)

https://www.udemy.com/course/draft/6213023/?referralCode=C586042AEC0B17DD4A0D

How to: Operating & Support Hazard Analysis (Mil-Std-882E)

https://www.udemy.com/course/draft/6222279/?referralCode=52AC8A5582A67DE77BB0

How to do Health Hazard Analysis with Mil-Std-882E

https://www.udemy.com/course/draft/6222285/?referralCode=F589E3A00F2F19CACDD3

How to do Functional Hazard Analysis with Mil-Std-882E

https://www.udemy.com/course/draft/6231311/?referralCode=E23E561F0202ACECA30B

How to do System of System Hazard Analysis (per Standard)

https://www.udemy.com/course/draft/6243643/?referralCode=AEE718911215D78E6D94

How to do Environmental Hazard Analysis with Mil-Std-882E

https://www.udemy.com/course/draft/6238409/?referralCode=4253568A1CF2CD848BB8

Free Courses

Introduction to System / Product / Design Safety Concepts

https://www.udemy.com/course/introduction-to-system-product-design-safety-concepts/?referralCode=E173BDB0AD2525946E04

How to Prepare for the CISSP Exam

https://www.udemy.com/course/my-cissp-2021-exam-journey/?referralCode=579F4FD19E8ED2865D54

Risk Management 101

https://www.udemy.com/course/risk-management-101-b/?referralCode=E7C50B702696E593C59D

Back to home.

Simon Di Nucci https://www.safetyartisan.com/courses/

Courses
Here are some of the courses that you can buy: The Safety Artisan – Udemy Course Links.

Stand-Alone Courses

How to Design a System Safety Program

https://www.udemy.com/course/system-safety-risk-analysis-programs/?referralCode=38B31C7BDD4DED49E44E

System Safety Engineering Process

https://www.udemy.com/course/system-safety-engineering-process/?referralCode=AA799BF5235D13D868D5

Principles of Software Safety Standards

https://www.udemy.com/course/principles-of-safe-software-design/?referralCode=25398951621CFC5B8471

System Safety Engineering Courses

How to: Preliminary Hazard Identification (Mil-Std-882E)

https://www.udemy.com/course/how-to-preliminary-hazard-identification-mil-std-882e/?referralCode=F681CF650D3BDDAD307B

How to: Preliminary Hazard Analysis (Mil-Std-882E)

https://www.udemy.com/course/draft/6187483/?referralCode=1A153CA582E27235304D

How: System Requirements Hazard Analysis with Mil-Std-882E

https://www.udemy.com/course/how-system-requirements-hazard-analysis-with-mil-std-882e/?referralCode=919C1FCE9C325351BA24

How To: Sub-System Hazard Analysis (per Standard)

https://www.udemy.com/course/how-to-sub-system-hazard-analysis-with-mil-std-882e/?referralCode=D014CFEB810BD288A741

How to do System Hazard Analysis (per Standard)

https://www.udemy.com/course/draft/6213023/?referralCode=C586042AEC0B17DD4A0D

How to: Operating & Support Hazard Analysis (Mil-Std-882E)

https://www.udemy.com/course/draft/6222279/?referralCode=52AC8A5582A67DE77BB0

How to do Health Hazard Analysis with Mil-Std-882E

https://www.udemy.com/course/draft/6222285/?referralCode=F589E3A00F2F19CACDD3

How to do Functional Hazard Analysis with Mil-Std-882E

https://www.udemy.com/course/draft/6231311/?referralCode=E23E561F0202ACECA30B

How to do System of System Hazard Analysis (per Standard)

https://www.udemy.com/course/draft/6243643/?referralCode=AEE718911215D78E6D94

How to do Environmental Hazard Analysis with Mil-Std-882E

https://www.udemy.com/course/draft/6238409/?referralCode=4253568A1CF2CD848BB8

Free Courses

Introduction to System / Product / Design Safety Concepts

https://www.udemy.com/course/introduction-to-system-product-design-safety-concepts/?referralCode=E173BDB0AD2525946E04

How to Prepare for the CISSP Exam

https://www.udemy.com/course/my-cissp-2021-exam-journey/?referralCode=579F4FD19E8ED2865D54

Risk Management 101

https://www.udemy.com/course/risk-management-101-b/?referralCode=E7C50B702696E593C59D

Back to home.

Simon Di Nucci https://www.safetyartisan.com/courses/

Friday, August 8, 2025

About

About The Safety Artisan - Safety Engineering and Risk Management Expert

About The Safety Artisan

https://youtu.be/qebeBeGj__4

Hi, everyone, and welcome to The Safety Artisan. I'm Simon, and I just wanted to share with you briefly why I started this enterprise. I've had a career in safety, engineering, and safety consulting for over 25 years now. And in that time, I've seen customers make one of two mistakes quite often. First of all, I've seen customers not do some things that they should have been doing. This was usually because they just were ignorant of what their legal obligations were.

And I guess that's a fairly obvious mistake. That's what you would expect me to say. But more often, I've seen customers do too much to try and achieve safety, which is surprising! I've seen people waste a lot of time, energy, and money doing things that just didn't make a difference. Sometimes it actually got in the way of doing good safety work.

And I think the reasons for those mistakes are, first of all, ignorance.

Secondly, not knowing precisely what safety is and therefore not being able to work out how to get there. That's why I started The Safety Artisan. I wanted to equip people with the knowledge of what safety really is and the tools to get there efficiently. To neither do too much nor too little. We want Safety, Just Right.

Simon Di Nucci, CPEng, FIEAust, NERNational Engineering RegisterMy Certified Skills

I have 25+ years of experience in safety engineering and consultancy. I've worked on aircraft, ships, submarines, air-traffic management systems, trains, and software. As an engineer and consultant, I've served on tiny projects and some of the biggest programs in the world.

I have worked in the UK and Australia, and on several projects, I've introduced American-made systems to both countries. It has been my privilege to teach safety to hundreds of people in the classroom. And I've presented on safety topics at several international conferences. See my full resume/CV here.

Our Mission and Values

artisan/ˈɑːtɪzan,ɑːtɪˈzan/Learn to pronounce noun

A worker in a skilled trade, especially one that involves making things by hand. “street markets where local artisans display handwoven textiles, painted ceramics, and leather goods”.

When I was choosing a name for my business, I thought of quite a lot of alternatives. I settled on The Safety Artisan for three reasons. First, I liked the meaning of the word. An individual pursuing their craft and trying to do it to the very best of their abilities.

Second, I liked the application. I’ve worked on a lot of very large, even multi-billion-dollar projects; but we’re still knowledge workers. We’re still individuals who must be competent to deliver good results for people.

And third, I liked the idea. Imagine a cottage industry of artisans working at home, delivering goods and services that other people can use wherever they are. Right now, you might be home or you might be on your mobile phone listening to this.

So, I liked all three of those things. I thought, yes, that’s what I’m about. That’s what I believe in and want to do. Does that sound good to you, too? Then check out The Safety Artisan's Topics, where I provide #safety #engineering #training.

Simon Di Nucci https://www.safetyartisan.com/about/

Tuesday, August 5, 2025

Topics

Here are the main topics taught by The Safety Artisan. Each page will take you to several teaching videos and other resources. Go to the Connect page to see how you can get updates every time a video or resource is added.

Start Here

Start here if you are new to safety! The posts featured on this page introduce basic safety topics, such as definitions and fundamental safety concepts. You can also start here if you know how to do safety in one industry and want to understand how it's done in another. Similarly, you might be familiar with safety practices in one country but want to know how things are done elsewhere.

Topics: System Safety Assessment

In this series of posts, we take you through a suite of safety analysis tasks. They are designed to deal with a complex system, but can be simplified (known as ‘tailoring’). We start with Preliminary Hazard Identification and work through detailed analyses, each with a different point of view of the system.

Topics: Work Health and Safety

Australian Work Health & Safety law, or WHS, addresses both design and workplace, or occupational, safety. It imposes duties upon designers, manufacturers, and importers of plant, structures, and substances.

Not finding what you are looking for? Please head over to the Connect Page and tell us what you need.

Simon Di Nucci https://www.safetyartisan.com/topics/

Monday, August 4, 2025

Software Safety Assurance

Software Safety Assurance is the fourth in a new series of six blog posts on Principles of Software Safety Assurance. In them, we look at the 4+1 principles that underlie all software safety standards. (The previous post in the series is here.)

Read on for These Benefits...

This post deals with some crucial software assurance topics: what is it? what does it mean? I add further explaining some key topics, based on my wide experience in the industry since 1994.

There are some important case studies here. They add depth and diversity to those already presented in previous posts. This post also addresses the crucial issues of diverse assurance techniques, as no one approach is likely to be adequate for safety significant software.

Content

We outline common software safety assurance principles that are evident in software safety standards and best practices. You can think of these guidelines as the unchanging foundation of any software safety argument because they hold true across projects and domains.

The principles serve as a guide for cross-sector certification and aid in maintaining comprehension of the “big picture” of software safety issues while evaluating and negotiating the specifics of individual standards.

Software Assurance = Justified Confidence

Principle 4+1:

The confidence established in addressing the software safety principles shall be commensurate to the contribution of the software to system risk.‘The Principles of Software Safety Assurance’, RD Hawkins, I Habli & TP Kelly, University of York.

All safety-related software systems must adhere to the four aforementioned principles. To prove that each of the guiding principles has been established for the software, evidence must be presented.

Depending on the characteristics of the software system itself, the dangers that are present, and the principle that is being shown, the proof may take many different forms. The strength and quantity of the supporting evidence will determine how confidently or assuredly the premise is established.

Therefore, it's crucial to confirm that the level of trust developed is always acceptable. This is frequently accomplished by making sure that the level of confidence attained corresponds to the contribution the software makes to system risk. This strategy makes sure that the areas that lower safety risk the most receive the majority of attention (when producing evidence).

This method is extensively used today. Many standards employ concepts like Safety Integrity Levels (SILs) or Development Assurance Levels (DALs) to describe the amount of confidence needed in a certain software function.

Examples

The flight control system for the Boeing 777 airplane is a Fly-By-Wire (FBW) system ... The Primary Flight Computer (PFC) is the central computation element of the FBW system. The triple modular redundancy (TMR) concept also applies to the PFC architectural design. Further, the N-version dissimilarity issue is integrated into the TMR concept.

Details are given of a 'special case procedure' within the principles' framework which has been developed specifically to handle the particular problem of the assessment of software-based protection systems. The application of this 'procedure' to the Sizewell B Nuclear Power Station computer-based primary protection system is explained.

Suitability of Evidence

Once the essential level of confidence has been established, it is crucial to be able to judge whether it has been reached. Several factors must be taken into account when determining the degree of confidence with which each principle is put into practice.

The suitability of the evidence should be taken into consideration first. The constraints of the type of evidence being used must be considered too. These restrictions will have an impact on the degree of confidence that can be placed in each sort of evidence with regard to a certain principle.

Examples of these restrictions include the degree of test coverage that can be achieved, the precision of the models employed in formal analysis approaches, or the subjectivity of review and inspection. Most techniques have limits on what they can achieve.

Due to these limitations, it could be necessary to combine diverse types of evidence to reach the required degree of confidence in any one of the principles. The reliability of each piece of evidence must also be taken into account. This takes into account the degree of confidence in the item of evidence's capacity to perform as expected.

This is also frequently referred to as evidence rigor or evidence integrity. The rigorousness of the technique employed to produce the evidence item determines its reliability. The primary variables that will impact trustworthiness are Tools, Personnel, Methodology, Level of Audit and Review, and Independence.

The four software safety principles will never change. However, there is a wide range of trust in how those principles are developed. We now know that a determination must be made regarding the degree of assurance required for any given system's principles to be established. We now have our guiding principle.

Since it affects how the previous four principles are put into practice, this concept is also known as Principle 4+1.

Software Safety Assurance: End of Part 4 (of 6)

This blog post is derived from ‘The Principles of Software Safety Assurance’, RD Hawkins, I Habli & TP Kelly, University of York. The original paper is available for free here. I was privileged to be taught safety engineering by Tim Kelly, and others, at the University of York. I am pleased to share their valuable work in a more accessible format.

Meet the Author

My name’s Simon Di Nucci. I’m a practicing system safety engineer, and I have been, for the last 25 years; I’ve worked in all kinds of domains, aircraft, ships, submarines, sensors, and command and control systems, and some work on rail air traffic management systems, and lots of software safety. So, I’ve done a lot of different things!

Principles of Software Safety Training

Learn more about this subject in my course 'Principles of Safe Software' here. The next post in the series is here.

My course on Udemy, 'Principles of Software Safety Standards' is a cut-down version of the full Principles Course. Nevertheless, it still scores 4.42 out of 5.00 and attracts comments like:

- "It gives me an idea of standards as to how they are developed and the downward pyramid model of it." 4* Niveditha V.

- "This was really good course for starting the software safety standareds, comparing and reviewing strengths and weakness of them. Loved the how he try to fit each standared with4+1 principles. Highly recommend to anyone that want get into software safety." 4.5* Amila R.

- "The information provides a good overview. Perfect for someone like me who has worked with the standards but did not necessarily understand how the framework works." 5* Mahesh Koonath V.

- "Really good overview of key software standards and their strengths and weaknesses against the 4+1 Safety Principles." 4.5* Ann H.

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Simon Di Nucci https://www.safetyartisan.com/2022/11/09/software-safety-assurance/