# Welcome to the Jakarta Expression Language TCK, Version 4.0
Your Starting Point

## Guide to Expression Language TCK 4.0 Documentation

The Expression Language TCK 4.0 documentation includes the following:

- The Expression Language TCK Release Notes provide last-minute information about the EL TCK, Version 4.0. The Release Notes are located in the TCK product bundle.

- The Jakarta Expression Language 4.0 Technology Compatibility Kit User's Guide provides the information you need to install, configure, and run the TCK. The User's Guide also contains the rules you need to pass for certification.

- The Javadoc Assertion List lists all the javadoc test assertions for the Expression Language TCK.

- The Specification Assertion List lists all the specification test assertions for the Expression Language TCK.

## JT Harness Documentation

The online version of the JT Harness version 5.0 documentation is available here.