Defined during:
General description:
They create the visual layout of the interface from user requirements, keeping usability (and possibly accessibility) issues in mind while creating them; those layouts will be implemented later by developers. Instead of performing evaluations, they would benefit from having a way to search for good practices about some particular topic.
Priority:
Domain knowledge:
They have from average to good knowledge of usability (possibly accessibility too) principles although not as good as dedicated evaluators.
Context of use:
Instead of performing explicit evaluations, they will use heuristics (more usability than accessibility ones) as a reference when creating their designs.
Special needs:
They will probably need a way to search for guidelines regarding some particular aspect while developing and refining the designs.