Portfolio analysis (PA) is a technique used to analyze organizations with multiple business units or product lines. PA helps managers allocate resources by assessing each business unit's market share, industry growth, competitive strengths, and attractiveness. Common PA models include the BCG matrix, GE model, and life cycle matrix. The BCG matrix analyzes market share and growth to classify business units as stars, cash cows, dogs, or question marks. The GE model rates industry attractiveness and competitive strength to identify build, maintain, or divest categories. PA aids strategic decisions like balancing risk and return across a portfolio.