Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
Sanjib.A
User Rank
CEO
Re: safety: spiral vs agile development model
Sanjib.A   2/19/2014 10:27:29 PM
NO RATINGS

This is great point you have brought out. I worked on the industrial safety system products following IEC 61508 and that standard also says the same thing. The independent assessor & approver TUV told us the same...the person writing the code shall not test. Also, the person writing the test plan shall not execute the test. I am from the electronics circuit design & FPGA back ground. My difficulty in understanding Agile is, in electronics design we cannot so incremental developments like it says in Agile....completing backlogs in sprints lasting for only two-three weeks and can't demonstrate a working product to the customers. Hardware development for safety critical system would be even tougher to execute (or won't make any sense) in this way. 

JeffL_2
User Rank
CEO
Re: safety: spiral vs agile development model
JeffL_2   2/19/2014 3:06:28 PM
NO RATINGS
I'm not at all sure that "spiral VS. agile" is the right way to frame the debate, considering how disparate the two approaches are, and I doubt whether many of us who have done heavily safety-critical projects ever get close enough to "agile" to know it very well at all. Nonetheless I could offer one comment, one of the "pluses" that's been touted for agile is that the code developer does the unit testing himself because he's the "best qualified" to understand the routine he's trying to code. This used to be common too in the older military coding standards like MIL-STD-1679 (I think that's the #, been awhile) but this is in direct contradiction to the premise of something like DO-178C where the notion is you specifically need different people writing the tests so you get "separation of responsibility" and the testing MUST be done by different people, so the critical part of writing the test code MUST be done "through a different pair of eyes". It kind of seems like in this example the advocates of agile don't even have the correct mindset to address the critical issues, and I would submit that if you took a closer look this type of "critical discrepancy" would likely be found throughout the process. I believe the two approaches at best (as currently defined at least) are barely compatible but I'd be willing to listen to an argument to the contrary.

Sanjib.A
User Rank
CEO
safety: spiral vs agile development model
Sanjib.A   2/18/2014 8:53:46 PM
NO RATINGS
This is a good topic and there could be a constructive and fruitful debate on it. I have worked on several safety projects and mostly functional safety per IEC 61508. A few years back, nobody questioned the process and it followed kind of spiral model or iterative waterfall or what ever you call it as. We spent several months in doing the FMEAs to understand the failure modes well, before starting the real development work. There were many reviews, especially by independent assessor. The project took almost double the time compared to if it were a normal project. Now a days with the popularity of Agile development, management perspective has got changed. Recently we were asked to think about executing a safety project with Agile development rigor...we could not figure out how it benefits...the project eventually did not get management focus, may be due to other reasons too. But I am not seeing any safety project being executed following Agile development.

Even if it is not a safety critical product, did somebody apply Agile development to hardware development successfully?



Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
<b><a href=Betajet">

The Circle – The Future's Imperfect in the Present Tense
Betajet
5 comments
The Circle, a satirical, dystopian novel published in 2013 by San Francisco-based writer Dave Eggers, is about a large, very powerful technology company that combines aspects of Google, ...

Max Maxfield

Recommended Reads From the Engineer's Bookshelf
Max Maxfield
27 comments
I'm not sure if I read more than most folks or not, but I do I know that I spend quite a lot of time reading. I hate to be idle, so I always have a book or two somewhere about my person -- ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...