# Writing the blueprint code
<a name="developing-blueprints-code"></a>

Each blueprint project that you create must contain at a minimum the following files:
+ A Python layout script that defines the workflow. The script contains a function that defines the entities (jobs and crawlers) in a workflow, and the dependencies between them.
+ A configuration file, `blueprint.cfg`, which defines:
  + The full path of the workflow layout definition function.
  + The parameters that the blueprint accepts.

**Topics**
+ [Creating the blueprint layout script](developing-blueprints-code-layout.md)
+ [Creating the configuration file](developing-blueprints-code-config.md)
+ [Specifying blueprint parameters](developing-blueprints-code-parameters.md)