I know this sentence was taken from http://incubator.apache.org/deltaspike/core.html, but I'm having trouble parsing it. I'm asking for clarification from Charles Moulliard, but I think something like this might be better:

ProjectStages (Project-stages?) provide a way to customize the implementation based on the type of deployment environment. For example, you may want to generate sample data for system testing, but not for production. You can create a bean that generates sample data and activate it only for project-stage `SystemTest`.