[SystemSafety] Data on Proof effectiveness from real projects

[paul_e.bennett at topmail.co.uk]

On 02/04/2016 at 7:39 PM, "Steve Tockey" <Steve.Tockey at construx.com> wrote:
>
>Paul,
>Of course, I agree 100%.
>
>What's your source for the 44% number? I'm very interested in that 
>kind of
>data. My source says 56% of defects are in requirements and 27% 
>are in
>design. Only 7% are coding. The remaining 10% are defects logged 
>against
>other things: test cases, test plans, project plans, etc.
>
>The source of this data is:
>
>Gary Mogyorodi, ³What is Requirements-Based Testing?², Crosstalk, 
>March,
>2003

Although the same vintage of information all the figures seem different.

My source is the UK Health & Safety Executive's 2nd Edition of the 
booklet "Out of Control", published in 2003. I don't know if anyone is
tracking such figures over time but that would be an interesting plot 
too.

See <http://www.hse.gov.uk/pubns/books/hsg238.htm> for teh download.

Regards

Paul E. Bennett IEng MIET
Systems Engineer

-- 
********************************************************************
Paul E. Bennett IEng MIET.....<email://Paul_E.Bennett@topmail.co.uk>
Forth based HIDECS Consultancy.............<http://www.hidecs.co.uk>
Mob: +44 (0)7811-639972
Tel: +44 (0)1392-426688
Going Forth Safely ..... EBA. www.electric-boat-association.org.uk..
********************************************************************