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The Test Book


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The bestselling authors of The Decision Book return with their most fascinating and practical book yet.

About the Author

Roman Tschappeler is the founder and CEO of guzo, a communication agency based in Biel, Switzerland. Mikael Krogerus is a writer for German and Swiss media. They are the authors of international bestseller The Decision Book [9781846683961] and its follow-ups The Question Book [9781846685385] and The Change Book [9781781250099], which have sold over a million copies worldwide.


Praise for The Decision Book: 'New-year stimuli to anyone who manages anything - even just their desk. * Independent *
A handy primer for anyone keen to tackle problems in a different way. * Director *

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