# Antithesis Authors - A Distributed Systems Reliability Glossary (Highlights) ![rw-book-cover|256](https://antithesis.com/images/Open-graph-image.png) ## Highlights - A [consistency model](https://jepsen.io/consistency/models) is a set of allowed histories. It constrains which [operations](https://antithesis.com/docs/resources/reliability_glossary#operation) are permissible, and in which orders. We say that one model is stronger than another if the stronger model’s allowed histories are a strict subset of the weaker model’s allowed histories. ([View Highlight](https://read.readwise.io/read/01kvczdev2cfp7w61ah5fxkfjh)) ^1026372373