| Reusable components - | (Software Engineering) configuration items that are reusable |
| Reverse engineering - | (Software Engineering) trying to develop design models or an understanding of design using program code as a starting point |
| Risk - | (Software Engineering) a potential problem or occurrence that put a project in jeopardy |
| Risk Management and Monitoring Plan (RMMP) - | (Software Engineering) a plan for mitigating, monitoring and managing risks |
| Scheduling - | (Software Engineering) the activity that lays out a timeline for work to be conducted on a project |
| Scope - | (Software Engineering) a bounded statement of what must be accomplished |
| Security - | (Software Engineering) the ability of software to operate in a manner that is secure from internal or external attack |
| Selective testing - | (Software Engineering) testing only a selected set of program paths and data inputs |
| Six sigma - | (Software Engineering) a widely used strategy for statistical quality assurance |
| Smoke testing - | (Software Engineering) an integration testing approach that constructs and tests software on a daily basis |