During the maintenance phase, support staff must prioritize fixes according to customer impact, operational risk, severity, and business need. To reduce inconvenience for customers, the team should focus first on defects that impact essential operations. These defects interfere with critical business functions, safety, availability, transactions, or required user tasks. Fixing all known defects may be unrealistic and can delay urgent corrections. Focusing only on minor defects would not address serious customer disruption. Concentrating only on the “vital few” customers may ignore defects that broadly affect essential operations across the user base. Software quality engineering emphasizes severity-based prioritization, risk management, and service continuity. Therefore, defects affecting essential operations should receive the highest maintenance attention.

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