This is a guide for entrepreneurs to examine and analyze their existing business models, and consequently to improve it. The in thing now is business model improvement for the 21st century vs strategy for the last 30 years.This lecture is for students of entrepreneurship elective at the MBA in Ateneo Graduate School of Business, a leading MBA school in the Philippines. It is being uploaded for the convenience of present and former students for the said elective. Formerly, innovations in business have been skin deep: processes, products and strategy. But the markets, customers, and competitive landscape are rapidly changing. A new and faster model for business to be up to speed is badly needed by big and small business alike and/or a deeper and more analytical understanding of their business model.