If you have a question, do not submit an issue; instead, search the [Cesium community forum](https://community.cesium.com/). The forum is very active and there are years of informative archives, often with answers from the core Cesium team. If you do not find an answer to your question, start a new thread and you'll likely get a quick response.
If you think you've found a bug in CesiumJS, first search the [issues](https://github.com/CesiumGS/cesium/issues). If an issue already exists, please add a comment expressing your interest and any additional information. This helps us prioritize issues.
- Screenshot or animated .gif if appropriate (try [LICEcap](http://www.cockos.com/licecap/)). For example, see [#3153](https://github.com/CesiumGS/cesium/issues/3153). Screenshots are particularly useful for exceptions and rendering artifacts. If it is a rendering artifact, also include the output of [webglreport.com](http://webglreport.com/).
- Link to the thread if this was discussed on the Cesium forum or elsewhere. For example, see [#3045](https://github.com/CesiumGS/cesium/issues/3045).
- Your operating system and version, browser and version, and video card. Are they all up-to-date? Is the issue specific to one of them?
- The version of Cesium. Did this work in a previous version?
- Ideas for how to fix or workaround the issue. Also mention if you are willing to help fix it. If so, the Cesium team can often provide guidance and the issue may get fixed more quickly with your help.
- Writing tutorials, creating examples, and improving the reference documentation. See the issues labeled [category - doc](https://github.com/CesiumGS/cesium/labels/category%20-%20doc).
- Triaging issues. Browse the [issues](https://github.com/CesiumGS/cesium/issues) and comment on issues that are no longer reproducible or on issues which you have additional information.
- Creating ecosystem projects for [glTF](https://github.com/KhronosGroup/glTF/issues/456), [CZML](https://github.com/CesiumGS/cesium/wiki/CZML-Guide), and [3D Tiles](https://github.com/CesiumGS/3d-tiles).
We love pull requests. We strive to promptly review them, provide feedback, and merge. Interest in Cesium is at an all-time high so the core team is busy. Following the tips in this guide will help your pull request get merged quickly.
> If you plan to make a major change, please start a new thread on the [Cesium community forum](https://community.cesium.com/) first. Pull requests for small features and bug fixes can generally just be opened without discussion on the forum.
This only needs to be completed once, and enables contributions to all of the projects under the [CesiumGS](https://github.com/CesiumGS) organization, including CesiumJS. The CLA ensures you retain copyright to your contributions, and provides us the right to use, modify, and redistribute your contributions using the [Apache 2.0 License](LICENSE.md).
- Review the [Contributor Guides](Documentation/Contributors/README.md). In addition to CesiumJS-specific topics, they contain a lot of general software development best practices.
- If your pull request fixes an existing issue, include a link to the issue in the description (like this: "Fixes [#1](https://github.com/CesiumGS/cesium/issues/1)"). Likewise, if your pull request fixes an issue reported on the Cesium forum, include a link to the thread.
- If your pull request needs additional work, include a [task list](https://github.com/blog/1375%0A-task-lists-in-gfm-issues-pulls-comments).
- Once you are done making new commits to address feedback, add a comment to the pull request such as `"this is ready"` since GitHub doesn't notify us about commits.
- Verify your code passes [ESLint](http://www.eslint.org/). Run ESLint for all of CesiumJS with `npm run eslint` or automatically run ESLint when files are saved with `npm run eslint-watch`. See the [Build Guide](Documentation/Contributors/BuildGuide/README.md).
- Verify that all tests pass, and write new tests with excellent code coverage for new code. Follow the [Testing Guide](Documentation/Contributors/TestingGuide/README.md).
- If you added third-party libraries, including new version of existing libraries, update [LICENSE.md](LICENSE.md). Mention it in [CHANGES.md](CHANGES.md). If you plan to add a third-party library, start a [GitHub issue](https://github.com/CesiumGS/cesium/issues/new) discussing it first.
