Re: [SystemSafety] Qualifying SW as "proven in use" [Measuring Software]

From: Peter Bishop < >
Date: Fri, 21 Jun 2013 14:04:34 +0100

I agree with Derek

Code quality is only a means to an end
We need evidence to to show the means actually helps to achieve the ends.

Getting this evidence is pretty tricky, as parallel developments for the same project won't happen.
But you might be able to infer something on average over multiple projects.

Derek M Jones wrote:
> Thierry,

>> To answer your questions:
>> 1) Yes, there is some objective evidence that there is a correlation 
>> between a low SQALE index and quality code.

> How is the quality of code measured?
> Below you say that SQALE DEFINES what is "good quality" code.
> In this case it is to be expected that a strong correlation will exist
> between a low SQALE index and its own definition of quality.
>> For example ITRIS has conducted a study where the "good quality" code 
>> is statistically linked to a lower SQALE index, for industrial 
>> software actually used in operations.

> Again how is quality measured?
>> No, there is not enough evidence, we wish there would be more people 
>> working on getting the evidence.

> Is there any evidence apart from SQALE correlating with its own
> measures?
> This is a general problem, lots of researchers create their own
> definition of quality and don't show a causal connection to external
> attributes such as faults or subsequent costs.
> Without running parallel development efforts that
> follow/don't follow the guidelines it is difficult to see how
> reliable data can be obtained.

Peter Bishop
Chief Scientist
Adelard LLP
Exmouth House, 3-11 Pine Street, London,EC1R 0JH
Recep:  +44-(0)20-7832 5850
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Received on Fri Jun 21 2013 - 15:04:56 CEST

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