Improvements to APSIM

In addition to encouraging entrepreneurial R&D, the APSIM Initiative has a key objective of ensuring the ongoing development of APSIM through the facilitation of broadly based collaborative science.

This is achieved through an open and transparent environment facilitating broadly based collaborative science.  The intent is to develop a high-quality and enduring agricultural production systems modelling platform, with global reach.

In exchange for free access to APSIM, licensed users may develop improvements and in turn relinquish ownership of these improvements to the AI. At its discretion, the AI may adopt the improvements and include these in APSIM.

The AI provides for distribution of modifications, promotes central control for quality assurance purposes, and considers structured innovation relevant to APSIM and its users.

This means that licensed users may access and modify APSIM source code, however all modifications to APSIM must be submitted to the AI and be subject to the Reference Panel evaluation and approval process before inclusion into official APSIM releases.

If you are thinking of contributing to APSIM then please read the Development Guidelines

The AI RP utilises the APSIM Initiative GitHub’s Organisation: for approving all software changes and development activities dealing with APSIM.

We encourage APSIM users and developers to engage with other APSIM developers via GitHub.  You are able to review the repository by clicking on the link above.  If you wish to comment, submit code modifications, you will need to register for a free account.  You can do that on

A visualisation of the APSIM Next Generation development between October 2019 and March 2020 can be viewed here.  This depicts work undertaken in GitHub as highlights development sprints and other notable activities. If you are interested in further information or being involved in future sprints, please email


For more information, please see: What is an APSIM Improvement?


Submission of Improvements

Any Improvements to APSIM are required to be unencumbered and the contributing party warrants that the IP being contributed does not and will not infringe any third party IPR rights. This is a requirement of the Non-Commercial R&D Licence as agreed to as part of the download of the APSIM software.  For more information, please see:  How do I submit an improvement to APSIM?