[SystemSafety] Safety Culture redux (David Green)

[Steve Tockey]

Paul,
For what it¹s worth, I plan on spending 60% of a software project¹s
technical effort on requirements.  This does include time to run formal
Fagan-style inspections of the requirements, with the investment in the
inspections being more than returned in reduced design and coding time.


‹ steve


-----Original Message-----
From: systemsafety <systemsafety-bounces at lists.techfak.uni-bielefeld.de>
on behalf of "paul_e.bennett at topmail.co.uk" <paul_e.bennett at topmail.co.uk>
Date: Saturday, February 24, 2018 at 5:57 AM
To: "systemsafety at lists.techfak.uni-bielefeld.de"
<systemsafety at lists.techfak.uni-bielefeld.de>
Subject: Re: [SystemSafety] Safety Culture redux (David Green)

On 24/02/2018 at 7:26 AM, "Steve Tockey" <Steve.Tockey at construx.com> wrote:
>
>My experience is that coding and developer testing should take no
>more than 10% of a software project¹s effort. The industry average
>is reported to be closer to 60%.

I don't know many who have measured the time taken to get the requirements
specification tested and fixed before they begin the development. This is
my
first task when a spec lands on my desk. It usually involves a lot of Q&A
communication between the client and provider and I have seen it burn up to
30% of the schedule. However, once something that is more coherent emerges,
the latter development goes quicker than expected with testing and review
being about 30% of the remainder. Especially with hardware development as
part of the project. That 30% includes coders own testing and the Fagan
style
inspections that are part of the review process.

These figures are provided by a totally manually applied development
process
that does not employ software tools for tasks that the mark one eyeball
can do
so much better.

Regards

Paul E. Bennett IEng MIET
Systems Engineer
Lunar Mission One Ambassador
-- 
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