On the separation of user interface concerns: A Programmer's Perspective on the Modularisation of User Interface Code

UX Methods: A Quick Guide to User Experience Research Methods
By James Pannafino
UX Methods: A Quick Guide to User Experience Research Methods
A Theoretical Framework for Ecological Interface Design
By Jens Rasmussen, Kim J. Vincente
A Theoretical Framework for Ecological Interface Design
Think Like a UX Researcher: How to Observe Users, Influence Design, and Shape Business Strategy
By Philip Hodgson, David Travis
The book will help you take a more strategic view of product design so you can focus on what really matters: the user's experience.
Benchmarking the User Experience
By Jeff Sauro
"This is a practical book about how to measure the user experience of websites, software, mobile apps, products, or just anything people use.