These tasks and knowledge usually come before any graphic design apply into a website, this will turn and push a website getting more value and understanding as usable.
Core Skills
research techniques
ethnography and discovery—user goals, motivations, and work patterns
user modeling—persona and scenario creation; role-playing
product design—product-level interaction principles and concepts
interaction design—function-level interaction principles and concepts
interface design—component-level interaction principles and concepts
information architecture and information design—content structure and presentation principles
Usability Skills
knowledge of usability testing principles and methods
knowledge of principles of cognitive psychology
Media Skills
understanding of bit-depth, pixel-density, and resolution issues
managing color palettes
icon design and pixel-level design
graphic user interface (GUI) screen layout and composition
page layout and composition
animation
sound design
prototyping—paper, Visual Basic, HTML/CSS, Director, Flash, or other methods
knowledge of file formats and tradeoffs
Source
The Skills of UX Professionals
By Robert Reimann
A UX designer has to have all the skills of any designer, but also needs to focus on people the users not just on business goals, skills, or techniques.”—Whitney Quesenbery
