Russell Bestley & Paul McNeil 
Visual Research [PDF ebook] 
An Introduction to Research Methods in Graphic Design

Packed with more than 200 colour illustrations,
Visual Research explores a range of research methods that can be used by graphic designers and visual communicators in the development of clear and purposeful design solutions. The book introduces key terms and theories that underlie design research; examining the importance of visual grammar and design literacy, audience, communication theory and semiotics.
Each chapter features case studies, many new to this edition, that demonstrate how the use of research methods can form the basis of effective visual communication and design problem solving, eschewing end-product analysis for a discussion of the way research feeds into the design process.
With new case studies from Matt Cooke, Colette Sadlier and many others, this new edition also brings together all of the »Key Concept» features and content from previous editions into their own distinct chapter, making it easier for readers to discover design-led tools and information design methods, for both print and on-screen design.