# Submitting an Issue

If you've clicked on the "guidelines for contributing" link from the GitHub issue tracker, you're in the right place. These guidelines will help the development team fix the issue.

These links will pre-populate an issue with a template:

| Libraries | Interfaces | Other |
|-----------|------------|-------|
[Stan (bug report)](https://github.com/stan-dev/stan/issues/new?body=%23%23%20Bug%20Report%0A%0A__Version__%0A%0A__Description__%0A%0A__Steps__%0A%0A__Output__%0A%0A__Expected%20Output__%0A%0A__Additional%20Information__%0A%0A) <br /> [Stan (feature request)](https://github.com/stan-dev/stan/issues/new?body=%23%23%20Feature%20Request%0A%0A__Version__%0A%0A__Category__%0A%0A__Description__%0A%0A__Example__%0A%0A__Additional%20Information__%0A%0A)| [CmdStan](https://github.com/stan-dev/cmdstan/issues/new?body=__CmdStan%20Version__%0A%0A__Operating%20System__%0A%0A__Compiler__%0A%0A__Description__%0A%0A__Steps__%0A%0A__Output__%0A%0A__Expected%20Output__%0A%0A__Additional%20Information__) <br /> [RStan](https://github.com/stan-dev/rstan/issues/new?body=__RStan%20Version__%0A%0A__R%20version__%0A%0A__Operating%20System__%0A%0A__Compiler__%0A%0A__Description__%0A%0A__Steps__%0A%0A__Output__%0A%0A__Expected%20Output__%0A%0A__Additional%20Information__%0A) <br /> [PyStan](https://github.com/stan-dev/pystan/issues/new?body=__PyStan%20Version__%0A%0A__Python%20version__%0A%0A__Operating%20System__%0A%0A__Compiler__%0A%0A__Description__%0A%0A__Steps__%0A%0A__Output__%0A%0A__Expected%20Output__%0A%0A__Additional%20Information__%0A) 	| [shinyStan](https://github.com/stan-dev/shinystan/issues/new?body=__shinyStan%20Version__%0A%0A__R%20version__%0A%0A__Operating%20System__%0A%0A__Description__%0A%0A__Steps__%0A%0A__Output__%0A%0A__Expected%20Output__%0A%0A__Additional%20Information__%0A) | 
[Math (bug report)](https://github.com/stan-dev/math/issues/new?body=%23%23%20Bug%20Report%0A%0A__Version__%0A%0A__Description__%0A%0A__Steps__%0A%0A__Output__%0A%0A__Expected%20Output__%0A%0A__Additional%20Information__%0A%0A) <br /> [Math (feature request)](https://github.com/stan-dev/math/issues/new?body=%23%23%20Feature%20Request%0A%0A__Version__%0A%0A__Description__%0A%0A__Example__%0A%0A__Additional%20Information__%0A%0A) <br /> |  <br /> |  <br /> |



# Detailed information


## Stan (bug report)

Use this template for describing problems with the Stan library. Please be as specific as possible. If you're able to provide a simple reproducible example, this will go a long way to helping the developers fix the bug.

__Title__

Please give a descriptive summary of the bug.

__Version__

For tagged versions, please report the version number in `src/stan/version.hpp`.

For git cloned versions, report the result of typing `git rev-parse HEAD` from the command line.

__Description__

Describe the problem as clearly as possible.

__Steps__

Steps to reproduce the bug, if possible. If not, a description of how you discovered the bug.

If you have a reproducible example, put it here.

__Output__

Output you get from triggering the bug. Knowing what Stan currently does is useful.

__Expected Output__

Describe what you expected to happen. Knowing what the correct behavior should be is also very useful.

__Additional Information__

Provide any additional information here.


## Stan (feature request)

Use this template for requesting new features in Stan.

__Title__

Please give a descriptive summary of the feature.

__Version__

For tagged versions, please report the version number in `src/stan/version.hpp`.

For git cloned versions, report the result of typing `git rev-parse HEAD` from the command line.

__Category__

Use one of the following or make up something reasonable:

- language
- new function
- algorithm

__Description__

Describe the feature you'd like in Stan. Be descriptive.

__Example__

Provide at least one example. Also mock up the expected result from that example.

__Additional Information__

Provide any additional information here.