---
title: "RCC: Reliable Change Criterion"
description: "Just another name and acronym for the RCI: Reliable Change Index. In general, I try to resist concepts changing their names, life is confusing enough if we only have one name per idea! However, I haven't been given the power…"
url: "https://www.psyctc.org/psyctc/glossary2/rcc-reliable-change-criterion/"
updated: "2026-06-01"
category: All OM book glossary entries
---

# RCC: Reliable Change Criterion

Just another name and acronym for the RCI: Reliable Change Index. In general, I try to resist concepts changing their names, life is confusing enough if we only have one name per idea! However, I haven't been given the power to insist on this (!) and, to be honest, this is one renaming that seems to me to be more accurate than the original name!

Not to be confused with the [Minimal Important Change](https://www.psyctc.org/psyctc/glossary2/minimal-important-difference-mid-mcid/) (and *its*own synomyms).

#### Try also

- [Minimal Important Change](https://www.psyctc.org/psyctc/glossary2/minimal-important-difference-mid-mcid/)
- [Reliable Change Index (RCI)](https://www.psyctc.org/psyctc/glossary2/reliable-change-index-rci/)

#### Chapters

Not covered in the OMbook as we hadn't come across the RCC for the RCI at the time!

#### Online resources

- [Interactive shiny apps](https://shiny.psyctc.org)
  - App that gives you the RCI (Reliable Change Index) [for given baseline score SD, reliability and the inclusion interval you want (usually .95, i.e. 95%)](https://shiny.psyctc.org/apps/RCI1/).
  - [App which extends that to give you a plausible interval around that RCI](https://shiny.psyctc.org/apps/RCI2/) using the confidence interval for the SD given your *n*.

#### Dates

First created 13.ii.25, updated with links to Minimal Important Change 30.vii.25.