[STACK](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/About/index.md) is an assessment system for mathematics, science and related disciplines.
[STACK](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/About/index.md) is an assessment system for mathematics, science and related disciplines.
STACK was created by [Chris Sangwin](http://www.maths.ed.ac.uk/~csangwin/) of the University of Edinburgh, and includes the work of many [other contributors](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/About/Credits.md). A demonstration server is available in Edinburgh: [https://stack.maths.ed.ac.uk/demo](https://stack.maths.ed.ac.uk/demo).
STACK was created by [Chris Sangwin](http://www.maths.ed.ac.uk/~csangwin/) of the University of Edinburgh, and includes the work of many [other contributors](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/About/Credits.md). A demonstration server is available in Edinburgh: [https://stack.maths.ed.ac.uk/demo](https://stack.maths.ed.ac.uk/demo).
STACK is based on continuing research and use at the University of Edinburgh, the Open University, Aalto, Loughborough University, the University of Birmingham and others.
## Current state of development
## Current state of development
STACK 4.0 is a major release containing significant new features and improvements, based on continuing research and use at the University of Edinburgh, the Open University, Aalto, Loughborough University, the University of Birmingham and others.
STACK 4.1 contains some important new features, and a number of interface improvements and bug fixes.
**Note: please read the release notes before upgrading from STACK 3.X to STACK 4.X. STACK 4.0 represents a major release of STACK and is a non-reversible change, with important differences which break back-compatability. Especially, note the [conversion of old materials](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/Authoring/ImportExport.md#migrating-stack-3-questions-to-stack-4).**
**Note: please read the release notes before upgrading from STACK 3.X to STACK 4.X. STACK 4.0 represents a major release of STACK and is a non-reversible change, with important differences which break back-compatability. Especially, note the [conversion of old materials](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/Authoring/ImportExport.md#migrating-stack-3-questions-to-stack-4).**
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The [documentation is here](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/index.md), including the [installation instructions](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/Installation/index.md).
The [documentation is here](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/index.md), including the [installation instructions](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/Installation/index.md).
## License
## License
Stack is Licensed under the [GNU General Public, License Version 3](https://github.com/maths/moodle-qtype_stack/blob/master/COPYING.txt).
Stack is Licensed under the [GNU General Public, License Version 3](https://github.com/maths/moodle-qtype_stack/blob/master/COPYING.txt).