Book excerpt: Risk modeling is now a core skill for successful managers inside and outside finance. Alastair Day's "Mastering Risk Modelling" shows managers exactly how to build Excel-based models for identifying, quantifying and managing risk--models that provide clear, accurate decision-making guidance that can be used with confidence throughout the enterprise. An ideal follow-up to Day's bestselling "Mastering Financial Modelling," the book brings together risk modeling theory and practice more effectively than ever before. Day presents extensive tips and methods for developing Excel-based risk applications--including practical guidance on designing models and layering complexity on top of basic models. His series of Excel templates will jumpstart your own modeling, eliminate the need to start from scratch, and provide powerful insights for improving any model. All models are provided on an accompanying CD-ROM.