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Exposing the Magic of Design: A Practitioner's Guide to the Methods and Theory of Synthesis Jon Kolko
Sketching User Experiences: Getting the Design Right and the Right Design Bill Buxton
Must Read

Highly rated with established community support.

Servicedesign Søren Bechmann
Bringing User Experience to Healthcare Improvement: The Concepts, Methods and Practices of Experience-based Design Paul Bate, Glenn Robert

Highly rated with growing community support.

101 Design Methods: A Structured Approach for Driving Innovation in Your Organization Vijay Kumar

Highly rated but with minimal community notice.

The Service Innovation Handbook: Action-oriented Creative Thinking Toolkit for Service Organizations Lucy Kimbell
Service Design: From Insight to Implementation Andy Polaine, Lavrans Løvlie, Ben Reason

Highly rated books published more than 15 years ago.

Design Research: Methods and Perspectives
Contextual Design: Defining Customer-Centered Systems Hugh Beyer, Karen Holtzblatt
Co-Design: A Process of Design Participation Stanley King, Merinda Conley, Bill Latimer, Drew Ferrari

Highly rated books with increasing popularity.

Designing Services with Innovative Methods: Perspectives on Service Design

Four star rating with established community support.

Designing for the Digital Age: How to Create Human-Centered Products and Services Kim Goodwin

Four star rating with growing community support.

Design Thinking: Integrating Innovation, Customer Experience, and Brand Value
Universal Methods of Design: 100 Ways to Research Complex Problems, Develop Innovative Ideas, and Design Effective Solutions Bruce Hanington, Bella Martin
Design Charrettes for Sustainable Communities Patrick M. Condon

Three star rating with established community support.

Service Design: Practical Access to an Evolving Field Stefan Moritz