Home Glossary Deviation Glossary Deviation By Deviation Check Editorial Team. Short answer Any difference between what the spec requires and what the submittal proposes, whether in manufacturer, model, performance, documentation, appearance, or installation method. Some are intentional substitutions and some are accidental omissions. Related terms Deviation reportSubstitution requestConformance Browse the full glossary, the CSI division guides, or learn how submittal review works. Then run a review. View this page as Markdown for LLMs and note-taking.