The best books to understand human behaviors that drive conversion rate optimization

Why am I passionate about this?

I’m the Founder & CEO of Widerfunnel, and the author of You Should Test That!. I launched Widerfunnel as the "anti-agency" with a purpose to prove that evidence-based decisions get the best results. Today, we run the experimentation, conversion rate optimization, qualitative research, and behavioral science programs for companies such as HP, Microsoft, Dollar Shave Club, The Motley Fool, TaylorMade Golf Company, and many more across all industries. I've spoken at over 300 events globally, sharing case studies, planning frameworks, and best practices of leading growth brands.


I wrote...

You Should Test That: Conversion Optimization for More Leads, Sales and Profit or the Art and Science of Optimized Marketing

By Chris Goward,

Book cover of You Should Test That: Conversion Optimization for More Leads, Sales and Profit or the Art and Science of Optimized Marketing

What is my book about?

This is the book that redefined Conversion Rate Optimization (CRO) for the new generation of digital marketers. Part science and part art, conversion optimization is designed to turn visitors into customers. Carefully developed experimentation procedures are necessary to help you design digital experiences that work. It will show you exactly how to fine-tune images, headlines, navigation, colors, buttons, and every other element, creating a website that maximizes sales. This book guides you through creating an optimization strategy that supports your business goals, using appropriate analytics tools, generating quality A/B testing ideas, running controlled online experiments, and making the adjustments that work.

You Should Test That explains both the "why" and the "how" of conversion optimization, helping you maximize the value of your website.

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The books I picked & why

Book cover of Influence: The Psychology of Persuasion

Chris Goward Why did I love this book?

In Influence, Robert Cialdini pioneered the popularization of psychological and behavioral principles that are practical and can be easily applied for marketers. It breaks down human behavior into 6 key principles of influence (and, more recently 7, in his updated version). It details why we as humans decide to say "yes" when prompted with an ask or decide to take a specific action that is directly applicable in our everyday work as experimenters. 

By Robert B. Cialdini,

Why should I read it?

23 authors picked Influence as one of their favorite books, and they share why you should read it.

What is this book about?

The foundational and wildly popular go-to resource for influence and persuasion-a renowned international bestseller, with over 5 million copies sold-now revised adding: new research, new insights, new examples, and online applications.

In the new edition of this highly acclaimed bestseller, Robert Cialdini-New York Times bestselling author of Pre-Suasion and the seminal expert in the fields of influence and persuasion-explains the psychology of why people say yes and how to apply these insights ethically in business and everyday settings. Using memorable stories and relatable examples, Cialdini makes this crucially important subject surprisingly easy. With Cialdini as a guide, you don't have…


Book cover of Predictably Irrational: The Hidden Forces That Shape Our Decisions

Chris Goward Why did I love this book?

In Predictably Irrational, Dan Ariely proves why the customers-know-best approach is romanticized and not coherent with how people think and act in the real world. The book opens our minds to how individuals can be complex in our decision-making, and how our behavioural and psychological complexity can make us both irrational and predictable at the same time. Most importantly, you can practically apply the theories and concepts in your digital marketing. Incorporating more insights from this book can inform better testing strategies that holistically understand the customer mindset, creating more aligned and better customer experiences.

By Dan Ariely,

Why should I read it?

13 authors picked Predictably Irrational as one of their favorite books, and they share why you should read it.

What is this book about?

Why do smart people make irrational decisions every day? The answers will surprise you. Predictably Irrational is an intriguing, witty and utterly original look at why we all make illogical decisions.

Why can a 50p aspirin do what a 5p aspirin can't? If an item is "free" it must be a bargain, right? Why is everything relative, even when it shouldn't be? How do our expectations influence our actual opinions and decisions?

In this astounding book, behavioural economist Dan Ariely cuts to the heart of our strange behaviour, demonstrating how irrationality often supplants rational thought and that the reason for…


Book cover of Competing Against Luck: The Story of Innovation and Customer Choice

Chris Goward Why did I love this book?

Every company wants to innovate, but it's not always clear how to do that in practice. Competing Against Luck highlights the importance of understanding what "jobs" your customer "hires" your product to do. The ‘Jobs to be Done Theory’ is one of the best frameworks I have seen to drive toward innovation and product-market fit. In the CRO world, we typically think about optimizing experience, but optimizing the product-market fit is equally as important.

By Clayton M. Christensen, Taddy Hall, Karen Dillon , David S. Duncan

Why should I read it?

1 author picked Competing Against Luck as one of their favorite books, and they share why you should read it.

What is this book about?

The foremost authority on innovation and growth presents a path-breaking book every company needs to transform innovation from a game of chance to one in which they develop products and services customers not only want to buy, but are willing to pay premium prices for. How do companies know how to grow? How can they create products that they are sure customers want to buy? Can innovation be more than a game of hit and miss? Harvard Business School professor Clayton Christensen has the answer. A generation ago, Christensen revolutionized business with his groundbreaking theory of disruptive innovation. Now, he…


Book cover of Don't Make Me Think: A Common Sense Approach to Web Usability

Chris Goward Why did I love this book?

I love Steve Krug’s Don’t Make Me Think because it does a great job of explaining how users look at websites in a fun, understandable, and applicable way. Steve does a great job of putting you in the perspective of the visitor to your website and challenges your own perspective as a professional working in marketing/web design/website management. This is truly required reading for any website designer or manager.  

By Steve Krug,

Why should I read it?

5 authors picked Don't Make Me Think as one of their favorite books, and they share why you should read it.

What is this book about?

Since Don't Make Me Think was first published in 2000, hundreds of thousands of Web designers and developers have relied on usability guru Steve Krug's guide to help them understand the principles of intuitive navigation and information design. Witty, commonsensical, and eminently practical, it's one of the best-loved and most recommended books on the subject.

Now Steve returns with fresh perspective to reexamine the principles that made Don't Make Me Think a classic-with updated examples and a new chapter on mobile usability. And it's still short, profusely illustrated...and best of all-fun to read.

If you've read it before, you'll rediscover…


Book cover of Thinking, Fast and Slow

Chris Goward Why did I love this book?

I recommend Thinking, Fast and Slow because it's essentially the encyclopedia of behaviour science. While it may feel very distant from the technical digital-first world of CRO, the root of how we think, behave, and make decisions as humans (read: users) are universal. More specifically, Kahneman’s theory of System 1 and System 2 thinking is a great lens to view human-computer interaction design through. It should at the very least help you consider your user interfaces and experiences through the lens of your user’s mental state.

By Daniel Kahneman,

Why should I read it?

42 authors picked Thinking, Fast and Slow as one of their favorite books, and they share why you should read it.

What is this book about?

The phenomenal international bestseller - 2 million copies sold - that will change the way you make decisions

'A lifetime's worth of wisdom' Steven D. Levitt, co-author of Freakonomics
'There have been many good books on human rationality and irrationality, but only one masterpiece. That masterpiece is Thinking, Fast and Slow' Financial Times

Why is there more chance we'll believe something if it's in a bold type face? Why are judges more likely to deny parole before lunch? Why do we assume a good-looking person will be more competent? The answer lies in the two ways we make choices: fast,…


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By Larry R. Frank Sr., Maxwell Limanowski (editor), Peter Sander (editor)

Book cover of Wealth Odyssey: The Essential Road Map for Your Financial Journey Where Is It You Are Really Trying to Go with Money?

Larry R. Frank Sr. Author Of Wealth Odyssey: The Essential Road Map for Your Financial Journey Where Is It You Are Really Trying to Go with Money?

New book alert!

Why am I passionate about this?

Author Father Grandfather Business founder Planner and thinker Income and longevity researcher

Larry's 3 favorite reads in 2023

What is my book about?

What are you trying to do with your money?

Few of us take the time to analyze our financial needs and goals to answer that pressing question. In Wealth Odyssey, author Larry R. Frank Sr. uses his extensive financial background to provide a universal road map that will help you determine the wealth you need to support your chosen lifestyle.

Frank discusses such topics as the wealth rule, the earning-spending-saving formula, using debt wisely, and 
risk management. 

Wealth Odyssey is authored to be timeless; it does not matter what the market has done, or will do. This is a practical, no-nonsense guide that will help you develop a personal definition of wealth and create an effective strategy for long-term financial success.

Wealth Odyssey: The Essential Road Map for Your Financial Journey Where Is It You Are Really Trying to Go with Money?

By Larry R. Frank Sr., Maxwell Limanowski (editor), Peter Sander (editor)

What is this book about?

"Frank, a Certified Financial Planner in California, offers a concise, precise guide to "prudent thinking" about personal finances, along with simple tools to estimate how much is required for a comfortable retirement." "A sound guide designed to help people make sensible plans for a successful retirement" - Kirkus book review "First let me tell you Larry Frank knows his stuff. He has a procedure that many will find worth taking the time to implement.” " The book is full of good advice." - Armchair interviews "Larry Frank Sr, gives you a guidebook or "road map" for your financial goals or…


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