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4 types of maintenance

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Describe an example of each of the four types of maintenance: corrective, adaptive, perfective, and preventive. Discuss how the decision to proceed is reached in each case. Be specific.

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The solution describes four different types of maintenance.

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Describe an example of each of the four types of maintenance: corrective, adaptive, perfective, and preventive
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* Corrective maintenance
- Involves the correction of errors in a piece of software, where an error is defined as a deviation from the specification (when an error blocks the system and impedes its normal operation).
Diagnosis and correction of errors
Testing will not uncover all errors
The corrective maintenance in turn is divide into two subtypes:
a) Urgent corrective, when the error must be cor-rected very quickly.
b) Non-urgent corrective, when the error resolu-tion can wait for some time.

? Example: ...

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