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# Thread: The Hunt for the Elusive ISQ Definition

1. ## The Hunt for the Elusive ISQ Definition

Hi folks,
I've recently come across what appears to be a metric used to help determine a Defect Find Rate called an ISQ. Co-workers haven't heard of it, and it appears that even the trusty Google is drawing a blank. Does anyone here know what it stands for?

In a Defect Find Rate chart, the ISQ runs up the Y axis, while the date runs across the X.

2. ## Re: The Hunt for the Elusive ISQ Definition

The only thing I can think of is Interval Scale Quotient. Interval Scale can be used to measure the difference between measurement points, like say applications X, Y, Z were all built using the same language and the Defect Rate for X is 6 per KLOC, while Y is 3.5 then it can be concluded that application X is 1.5 defects per KLOC higher than Y. Or the ratio of X to Y is the same as Y to Z if Z's defect rate was 2 per KLOC thus the Quotient part.

Just an Idea. Maybe not what it really stands for though.

3. ## Re: The Hunt for the Elusive ISQ Definition

Ok, Rich. I'm crying uncle. You got me with that one. I read it three times, and still have no idea what you were saying....

Have you been snorting your wasabi?

4. ## Re: The Hunt for the Elusive ISQ Definition

Mmm thats a new one on me, but unfortunately doesn't fit the jigsaw- the metric value is the number of ISQs, not value(s). Good suggestion though [img]images/icons/smile.gif[/img]

5. ## Re: The Hunt for the Elusive ISQ Definition

Mike - could you tell us WHERE you came across this metric with this explanation? Maybe if we go back to the source.....

6. ## Re: The Hunt for the Elusive ISQ Definition

Darrel,
What part of
"The only thing I can think of is Interval Scale Quotient. Interval Scale can be used to measure the difference between measurement points, like say applications X, Y, Z were all built using the same language and the Defect Rate for X is 6 per KLOC, while Y is 3.5 then it can be concluded that application X is 1.5 defects per KLOC higher than Y. Or the ratio of X to Y is the same as Y to Z if Z's defect rate was 2 per KLOC thus the Quotient part."
<font size="2" face="Verdana, Arial, Helvetica"> don't you understand?
I took this out of "Metrics and Models in Software Quality Engineering" by Stephen Kan. Of course I did elaborate on it a tiny bit.

7. ## Re: The Hunt for the Elusive ISQ Definition

Does this help (no mention of ISQ)?

http://www.research.ibm.com/journal/sj/411/bassin.html

8. ## Re: The Hunt for the Elusive ISQ Definition

Rich, my brain must have gone into weekend mode one day early. All looked like gibberish to me. What is a KLOC? A German clock?

Re-reading it, it sounds like the old "man lost in the fog in a helicopter in Seattle" joke. Totally accurate information, totally useless.

Of course, that is a smack at Kan, not you. [img]images/icons/smile.gif[/img]

9. ## Re: The Hunt for the Elusive ISQ Definition

Essentially the mention of ISQ is from my company's handbook (we're a testing consultancy). I have the feeling that the chart and data used was taken from a source that was either not using the generic acronyms, or was referring to a home-made metric which is specific to that individual company.

Never mind, thanks anyway, I'm gonna fustratingly abandon the search my end- but if any of guys are keen on continuing the hunt for the Atlantis of TLAs, than please do [img]images/icons/grin.gif[/img]

10. ## Re: The Hunt for the Elusive ISQ Definition

Darrel, KLOC is "Thousand lines of code", and I thought you knew everything.

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