# 4 Mozart 1.3.0

Mozart 1.3.0 is both the development and maintenance release. The work on 1.3.0 began immediately after 1.2.0, while the subsequent 1.2.* releases were intended primarily as maintenance releases. The Mozart system that became 1.3.0 has been extensively (and successfully) used for our own research projects.

The changes in the language, Mozart libraries and the implementation are summarized in the following sections.