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- Newsgroups: comp.software-eng
- Path: sparky!uunet!think.com!ames!pioneer.arc.nasa.gov!lamaster
- From: lamaster@pioneer.arc.nasa.gov (Hugh LaMaster)
- Subject: Productivity Data (was Re: Will we keep ignoring this productivity issue?)
- Message-ID: <1992Nov16.201453.11367@news.arc.nasa.gov>
- Sender: usenet@news.arc.nasa.gov
- Organization: NASA Ames Research Center, Moffett Field, CA
- References: <Bwtn3H.F2@iat.holonet.net> <1992Nov1.132750.9856@vax.oxford.ac.uk> <1776@aviary.Stars.Reston.Unisys.COM> <1992Nov11.055130@eklektix.com>
- Date: Mon, 16 Nov 1992 20:14:53 GMT
- Lines: 111
-
- In article <1992Nov11.055130@eklektix.com>, rcd@raven.eklektix.com (Dick Dunn) writes:
- |> This was in the "productivity of a C programmer" thread, about a week ago.
-
- Unfortunately, I don't have a new data point for C programmers. If you can
- stand to consider the ugliness of RPG and JCL, there is a recent article
- in the "Software Engineering Journal" on this subject.
-
- |> >...However, it is a fairly-well-established rule of thumb that
- |> >very good programmers can be an order of magnitude or more productive than
- |> >the average and do a good job...
- |>
- |> We toss this number around a lot. A couple years ago I tossed it at a
- |> friend who does a lot of real-time, control-system, etc. programming...just
- |> to test his reaction, since he's generally good for a strong opinion. But
- |> his retort came from a direction I hadn't expected: he said "It's more like
- |> *two* orders of magnitude! You get the first order-of-magnitude difference
- |> when the code is written. The second comes during maintenance." (Cf. also
- |> Mark Terribile's comments about changes being made to the best code, because
- |> it's the code people can figure out how to change.)
- |>
- |> Well, maybe the difference is an order of magnitude, maybe two. Be very
- |> conservative, go below the geometric mean; assume it's only a factor of 20.
- |>
- |> *ONLY*???
-
-
- The data, in "A software development postmortem summary", are as follows.
- The project involved the use of RPG, JCL, screen management, data-file
- specifications, etc. A very different environment than the C environment
- referred to in the original posting.
-
- Classifying by experience ONLY, the authors found the following:
-
- Experience Class Years of Exp. LOC/month Errors/KLOC
- ______________________________________________________
-
- Inexperienced 0-2 259 13.6
- Moderately Experienced 3-7 692 8.3
- Experienced 8+ 1195 5.3
-
-
- Now, when you consider the presumed cost of an error, the 4-5X difference
- in productivity is magnified (introduce your favorite method of
- dealing with cost of errors here).
-
- ***********************
-
- Herewith the reference:
-
- Formatted:
- **********
-
- Tsui, F., S. C. Hofmann, and W. J. Goldstrohm, Jr., "A software
- development post-mortem summary," Software Engineering Jour-
- nal, vol. 7, no. 4, pp. 277-284, IEE/BCS, London, July,
- 1992. Comment [Hugh LaMaster, personal comment]: Project
- was in RPG, JCL, etc. Experienced programmers were 5 times
- faster than inexperienced programmers with 40% of the er-
- rors. Inexperienced ( 0-2 yrs.) 259 LOC/month
- 13.6 errors/KLOC Moderately experienced (3-7 yrs.) 692
- LOC/month 8.3 errors/KLOC Experienced ( 8+ yrs.)
- 1195 LOC/month 5.3 errors/KLOC
-
- Software development requires the integration of many con-
- cepts and activities. We looked at five key elements: peo-
- ple, functions, schedule, tools and processes. These five
- elements and their dynamics are discussed in the context of
- a business applications project. This analysis is performed
- in the spirit of a project post-mortem, as encouraged by
- Abdel-Hamid and Madnick. It also provides data with which
- other business applications developers can compare.
-
-
- Bib:
- ****
-
- %A F. Tsui
- %A S. C. Hofmann
- %A W. J. Goldstrohm, Jr.
- %T A software development post-mortem summary
- %J Software Engineering Journal
- %V 7
- %N 4
- %P 277-284
- %I IEE/BCS
- %C London
- %D July, 1992
- %K Recommended, software development, productivity, quality
- %O Comment [Hugh LaMaster, personal comment]:
- Project was in RPG, JCL, etc. Experienced programmers were 5 times
- faster than inexperienced programmers with 40% of the errors.
- Inexperienced ( 0-2 yrs.) 259 LOC/month 13.6 errors/KLOC
- Moderately experienced (3-7 yrs.) 692 LOC/month 8.3 errors/KLOC
- Experienced ( 8+ yrs.) 1195 LOC/month 5.3 errors/KLOC
- %X Software development requires the integration of many
- concepts and activities. We looked at five key elements:
- people, functions, schedule, tools and processes. These
- five elements and their dynamics are discussed in the context
- of a business applications project. This analysis is performed
- in the spirit of a project post-mortem, as encouraged by
- Abdel-Hamid and Madnick. It also provides data with which other
- business applications developers can compare.
-
-
-
-
- --
- Hugh LaMaster, M/S 233-9, UUCP: ames!lamaster
- NASA Ames Research Center Internet: lamaster@ames.arc.nasa.gov
- Moffett Field, CA 94035-1000 Or: lamaster@george.arc.nasa.gov
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