I participate in a project where "the owner" of the project is also user of it. Overall, it is a project to manage hardware certifications and / or software. The system is scalable and can be used by others.
The issue is that it needs to undergo a process of redesign but I'm out of ideas of how I act to perform some kind of usability testing to be able to propose a new interface / interaction.
Create personas and drive a rapid test usability? I realize only a heuristic evaluation of the interface that already exists?