A user role is a particular kind of relationship between some users and a system. In other words, roles are played by users.
What is UX manager?
UX manager (formerly UCDmanager) is a FREE collaborative web application aimed to manage and document different User-Centered Design and User Experience / usability techniques, in an integrated manner: user roles, personas, heuristic evaluations, usability user testing, etc.
A persona is a fictional person who represents a major user group for your system.
An abstract or essential use case is a simplified, abstract, generalized use case that captures the intentions of a user in a technology and implementation independent manner.
Heuristic evaluation is done as a systematic inspection of a user interface design for usability.
A conformance evaluation determines if a web site or app meets accessibility standards, such as the Web Content Accessibility Guidelines (WCAG).
Applies to all websites, including web applications and mobile websites. It covers different situations, including self-assessment and third-party evaluation. It is independent of particular evaluation tools, web browsers, or assistive technologies.
Usability testing is a technique used to evaluate a product by testing it with representative users.