Measuring a user experience can be intimidating at first, but it's an essential part of determining whether your work is moving in the right direction (and by how much). UX Master Certified Dr. John Pagonis shares his experiences from working with other organizations on measuring UX improvements and interpreting quantitative data.
Learn more about John Pagonis:

Connect with him on LinkedIn
Watch a past keynote talk: Usefulness measurement: A practical guide for all UXers (37 min video)⁠

NN/g Articles, Videos, and Reports about Usability and UX Metrics:

Usefulness, Utility, and Usability by Jakob Nielsen, PhD (2-min video)
Usability 101 by Jakob Nielsen, PhD (free article)
⁠UX Metrics and ROI by Kate Moran⁠⁠ (297-page report)

NN/g Articles about Microsoft's Desirability Toolkit and Adjectives List

⁠Using the Microsoft Desirability Toolkit to Test Visual Appeal⁠ (free article)
⁠Microsoft Desirability Toolkit Product Reaction Words⁠ (free article)

Jeff Sauro, PhD on UX-Lite, UMUX-Lite, SUS, SEQ
(an aside: his website, MeasuringU.com, is an excellent resource)

10 Things To Know About The Single Ease Question (SEQ)
Measuring Usability with the System Usability Scale (SUS)
5 Ways to Interpret a SUS Score
Measuring Usability: From the SUS to the UMUX-Lite
⁠Evolution of the UX-Lite⁠