ISQT Process & Consulting Services Pvt. Ltd., Bangalore, INDIA
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  The bathtub curve for Software Reliability

Fig 1. Bathtub curve for hardware reliability

Software reliability, however, does not show the same characteristics similar as hardware. A possible curve is shown in Figure 2 if we projected software reliability on the same axes. There are two major differences between hardware and software curves. One difference is that in the last phase, software does not have an increasing failure rate as hardware does.

In this phase, software is approaching obsolescence; there are no motivation for any upgrades or changes to the software. Therefore, the failure rate will not change. The second difference is that in the useful-life phase, software will experience a drastic increase in failure rate each time an upgrade is made. The failure rate levels off gradually, partly because of the defects found and fixed after the upgrades.

Fig 2. Revised bathtub curve for software reliability

The upgrades in Figure 2 imply feature upgrades, not upgrades for reliability. For feature upgrades, the complexity of software is likely to be increased, since the functionality of software is enhanced. Even bug fixes may be a reason for more software failures, if the bug fix induces other defects into software.

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You may contact us at the telephone numbers mentioned below, or at any of the following email addresses:

Advisory Services
   Mr. Arunkumar Khannur

General Information

   Vijay George
   +91 81476 28351
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   Padma B
   +91 99000 96338
Institutional Services & Placements
   Vijay George
   +91 81476 28351
Email Support
ISQT Process & Consulting Services Private Limited, # 732, 1st Floor, 12th Main, 3rd Block, Rajajinagar, Bangalore - 560 010, INDIA
Phone:+ 91- 80 - 23012501-15 | Fax: + 91 80 23142425