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This book will change how you approach building models and applications in Excel. Jordan (the author) forces you to think outside the box, and makes some strong arguments against "standard" spreadsheet development practices.
He covers a lot of different areas including alternatives to nested IF statements, database modeling techniques, and sensitivity analysis. The second part shows you how to create a real world example of a model using all the concepts presented in the first part of the book. Sample Excel files are provided so you can follow along with the book, and also use them in your own models.
The content is great, but I gave this a 5 star rating because I do NOT agree with every concept Jordan presents. He makes some arguments for a different approach to developing Excel models with VBA applications. This includes things like naming conventions, how to store your macros and modules, and more. These theories made me think about my own development practices, and how I do things because "I've always done them a certain way". Even though I might not adopt all the practices presented in the book, it forced me to take a step back and think about things from a higher level. Forcing yourself to think outside the box spurs creativity and can really help you grow.