Hufflepuff
3. 
Guards! Guards! (Discworld, #8; City Watch, #1)
by:
Terry Pratchett
4.34 avg rating — 228,922 ratings 4. 
Supercooperators: The Mathematics of Evolution, Altruism and Human Behaviour {Or, Why We Need Each Other to Succeed}
by:
M.A. Nowak
3.84 avg rating — 401 ratings 5. 
The Logic of Collective Action: Public Goods and the Theory of Groups
by:
Mancur Olson
3.97 avg rating — 997 ratings 6. 
The Complexity of Cooperation: Agent-Based Models of Competition and Collaboration
by:
Robert Axelrod
really liked it 4.00 avg rating — 200 ratings 
9. 
The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change
by:
Stephen R. Covey
4.16 avg rating — 801,982 ratings 10. 
Crucial Conversations: Tools for Talking When Stakes are High
by:
Kerry Patterson
4.07 avg rating — 79,666 ratings 11. 
Getting to Yes: Negotiating Agreement Without Giving In
by:
Roger Fisher
3.94 avg rating — 84,170 ratings 12. 
How to Disagree Without Being Disagreeable: Getting Your Point Across With the Gentle Art of Verbal Self-Defense 3.87 avg rating — 196 ratings
15. 
The Luck Factor: Changing Your Luck, Changing Your Life - The Four Essential Principles
by:
Richard Wiseman
3.84 avg rating — 2,024 ratings 16. 
The As If Principle: The Radically New Approach to Changing Your Life
by:
Richard Wiseman
3.79 avg rating — 484 ratings 
18. 
How Pleasure Works: The New Science of Why We Like What We Like
by:
Paul Bloom
3.71 avg rating — 3,692 ratings 19. 
Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values (Phaedrus, #1)
by:
Robert M. Pirsig
3.78 avg rating — 241,476 ratings 
21. 
The Science of Fear: Why We Fear the Things We Shouldn't--and Put Ourselves in Greater Danger
by:
Daniel Gardner
3.97 avg rating — 5,717 ratings 
24. 
Emotional Intelligence: Why It Can Matter More Than IQ
by:
Daniel Goleman
4.05 avg rating — 131,737 ratings 25. 
27. 
Getting Things Done: The Art of Stress-Free Productivity
by:
David Allen
4.01 avg rating — 165,265 ratings 