Concordion is a specification by example framework originally developed by David Peterson,[1] and now maintained by a team of contributors,[2] led by Nigel Charman.

This makes the specifications much more natural to read and write, and helps everyone to understand and agree about what a feature is supposed to do.

Concordion includes a flexible extension mechanism[6] for adding functionality, for example implementing new commands, listening to events, or modifying the output documentation.

[12] The Concordion Support plugin for the IntelliJ IDEA Integrated development environment (IDE) simplifies development of fixtures and specifications with features including autocompletion, navigation between spec and test fixture, renaming, running tests, inspections and quick fixes.

[14] The original author has stopped using Concordion and Eclipse and is unable to accommodate the necessary time to extend and maintain the plugin.