a. **If you want to report a bug:**

  1. Crete a [jsFiddle](jsfiddle.net) with the minimal amount of code to reproduce the bug.
  2. Create a [Github Issue](https://github.com/mootools/mootools-core/issues), and link to the jsFiddle.

b. **If you want to fix a bug:**

  1. Clone the repo.
  2. Fix the bug.
  3. Add a [spec](http://jasmine.github.io/1.3/introduction.html).
  4. Build and run the specs.
  5. Push to your Github fork.
  6. Create Pull Request.
  7. Send pull request.