Click on a link to download a usable copy of the template. (PAT-024 - ) PAT-024 - Checklist for Choosing Off-The Shelf Software Topic 6.4, Also in SWE-027 and categories: Commercial and Legacy Software, and Coding Practices. (PAT-025 - ) PAT-025 - Checklist for Choosing a Real Time Operating System (RTOS) SWE-027, tab 3.1, Also in Topic 6.3.