Jakob Nielsen's 10 general principles for interaction design. They are called "heuristics" because they are broad rules of thumb and not specific usability guidelines.
Usability
10 Usability Heuristics for User Interface Design
Knowledge
UX Process: What It Is, What It Looks Like and Why It’s Important
In this article, we’ll define a general UX design process, as well as the order in which specific UX phases should be taken. We will also see what methods can be used by UX designers during each phase.
Processes, Project Management
UX Process: What It Is, What It Looks Like and Why It’s Important
Anyone including non-designers can use this framework to analyse a product or service or analyse a piece of work for a potential client. You could even use this to review your own work as the tools and techniques I use leave little room for bias.