Apply SWEBOK v4 Software Maintenance: evolve and sustain software after delivery — corrective/adaptive/perfective/preventive maintenance, impact analysis, maintainability, technical-debt and maintenance cost estimation, reengineering/reverse engineering. Use whenever the user is planning maintenance, estimating tech debt, doing impact analysis, reengineering legacy code, or asks about "manutenção", "legado", "dívida técnica", "refatoração de legado", "análise de impacto" — not only when SWEBOK is named.
