This document outlines the history and development of the BCG growth-share matrix, a tool created by the Boston Consulting Group in the 1970s to analyze business opportunities and competitive ability. It describes the key components of the matrix, including market share, market growth rate, and how products move through the product lifecycle. The matrix sorts products into four categories - stars, question marks, cash cows, and dogs - based on their market share and growth rate. It provides recommendations for resource allocation and investment for products in each category. While simple, the BCG matrix gives a quick way to evaluate opportunities and make strategic resource decisions.