BCG matrix

The BCG Matrix (also called the Growth-Share Matrix) is a portfolio-planning framework the Boston Consulting Group developed in 1970 to help companies decide where to invest across multiple products or business units. It plots each offering on two axes: market growth rate and relative market share, creating four quadrants that describe both a product's current position and, roughly, where cash should flow to or from it.

BCG Matrix

The Four Quadrants

1. Stars (high growth, high share): Market leaders in a growing market. Stars usually need continued investment to maintain their position, but they're expected to become tomorrow's Cash Cows.
2. Cash Cows (low growth, high share): Established leaders in a mature market. They generate more cash than they need to maintain their position, funding investment elsewhere.
3. Question Marks (high growth, low share): Products in a fast-growing market where you don't yet have a strong position. They require investment to become Stars or a decision to exit before they drain resources.
4. Dogs (low growth, low share): Low-share products in a slow-growing market. These typically generate little cash and are candidates for divestment or discontinuation.

How to Use the BCG Matrix

1. Plot each product or business unit by its market growth rate and relative market share.
2. Look at the portfolio as a whole, not one quadrant in isolation. A healthy portfolio usually has Cash Cows funding Stars and select Question Marks.
3. Decide an action per quadrant: invest, hold, harvest, or divest rather than treating every product with the same strategy.
4. Revisit periodically, since products migrate between quadrants as markets mature and competitive position shifts.

BCG Matrix vs. Other Portfolio Tools

The BCG Matrix answers "where should we invest across our existing portfolio?" a different question from the Ansoff Matrix, which asks "which new products or markets should we enter?" It's also a coarser-grained tool than a Priority Matrix, which typically ranks individual initiatives or features rather than entire product lines. Many teams use the BCG Matrix at the portfolio level, then a Priority Matrix to sequence the work within a given quadrant.

That's where Porter's Generic Strategies come in, setting the competitive approach (cost leadership, differentiation, or focus) once BCG has decided where to invest. Teams often use BCG at the portfolio level, Porter's to decide how each unit competes, and a Priority Matrix to sequence the work.

Portfolio positions shift more quickly than most annual reviews assume, since a Star's growth rate or a Cash Cow's share position can move meaningfully within a couple of quarters - treating the matrix as a fixed chart from last year's planning cycle is often the first sign a portfolio review is overdue. Building it on a collaborative online whiteboard like MockFlow IdeaBoard keeps the placement live and debatable, letting a leadership team move a product between quadrants as new share and growth data comes in, rather than defending a static chart someone else already finalized.