Industry analysis is a tool that facilitates a company's understanding of its position relative to other companies that produce similar products or services. Understanding the forces at work in the overall industry is an important component of effective strategic planning. Industry analysis enables small business owners to identify the threats and opportunities facing their businesses, and to focus their resources on developing unique capabilities that could lead to a competitive advantage.
An industry analysis consists of three major elements: the underlying forces at work in the industry; the overall attractiveness of the industry; and the critical factors that determine a company's success within the industry.
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How to Write a Business Plan 8th ed. by 
The Entrepreneur's Guide to Writing Business Plans and Proposals by K. Dennis Chambers
The Complete Book of Business Plans by 
Business Plans Kit for Dummies by Steven D. Peterson
Hoover's Handbook of American Business by Hoover, Gary
Essentials of Entrepreneurship and Small Business Management by 
The Successful Business Plan: Secrets and Strategies by