A01 chaf6542 06 se fm indd

  6 Very serious

Crash occurs regularly in one 

module

Immediate solution needed

Urgent patch required for 

module, revert to previous 

version

  7 Extreme

Frequent very serious errors

Immediate solution needed

Urgent patch required for 

module, revert to previous 

version

  8 Intolerable

Database corruption

Immediate solution needed

Urgent patch required for 

module, revert to previous 

version

  9 Catastrophic

System crashes, cannot be 

restarted – system unusable

Immediate solution needed

Urgent patch required for 

module, revert to previous 

version

10 Infectious

Catastrophic problem also 

causes failure of other systems

Immediate solution needed

Revert to previous version

Source: Copyright © 1995 from Software Testing: A Craftsman’s Approach by Paul C. Jorgensen. Reproduced by permission of 

Routledge/Taylor & Francis Group, LLC.

Table 12.3

Fault taxonomy described in Jorgensen (1995) applied to an e-commerce site

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Chapter 12  Digital business service implementation and optimisation