Porter's Five Forces — An Industry Structure Analysis Skill with Cited Evidence

Skill Overview

Porter's Five Forces is a market intelligence analysis skill based on the Five Forces model. It evaluates, one by one, the intensity of competition, the threat of new entrants, the threat of substitutes, buyer power, and supplier power in a specified industry or market segment. Each rating is accompanied by verifiable, documented signals, ultimately answering one core question: Where is the industry's profit pool, and who is squeezing it?

Use Cases

1. Stress-testing a market entry decision: Before entering a new market, such as clinical data management SaaS, first clarify how the industry structure affects each player, then decide whether to enter or partner.
2. Structurally explaining declining gross margins: When gross margins continue to shrink and all explanations remain tactical, use Five Forces analysis to identify the structural causes instead of blaming sales execution.
3. Grounding strategy debates in evidence rather than intuition: When a team argues that “competition is too intense” or “this market is difficult,” use signal-backed weak/moderate/strong ratings and Fact/Inference labels to bring the discussion back to verifiable evidence.

Core Functions

1. Five Forces ratings + documented signals: Assign a weak/moderate/strong rating to each force and provide 2–4 supporting signals, such as market concentration, switching costs, new entrant cases and their outcomes, substitute adoption curves, and margin trends. Each signal is labeled Fact or Inference, so the rating can withstand the question, “How do you know that?”
2. Dedicated assessment of the AI substitution threat: Explicitly identify and evaluate AI-driven substitutes in the substitutes analysis. AI workflows and agents are increasingly absorbing low-complexity tasks in knowledge industries. At the same time, treat dependence on cloud providers, models, and platforms as supplier concentration in the supplier power analysis.
3. Profit pool conclusion: The analysis does not stop at a rating table. It concludes by identifying where the profit pool lies, which force is squeezing it, whether the industry structure is tightening or loosening, and how this directly relates to the decision at hand—whether to enter and how to enter.

Frequently Asked Questions

What is the basis for the ratings? Could they be merely subjective impressions?

No. The hard requirement of this skill is that every rating must be grounded in documented signals—market concentration data, switching costs, new entrant cases and their outcomes, substitute adoption curves, and so on. Fabricating market shares, profit data, entrant lists, or financing information is explicitly prohibited. A rating without supporting signals is considered a “gut feeling” and does not qualify as a completed analysis.

What is the difference between Porter's Five Forces analysis and SWOT analysis?

Five Forces examines how industry structure affects each player—the economics of profitability, such as pricing power, are structural. SWOT examines a particular company's position within that structure. Typically, Five Forces is used first to understand the industry, followed by SWOT to determine one's own position. This skill can be used alongside a market landscape scan: the latter answers “Who is participating?” while Five Forces answers “How will the structure treat them?”

When is this analysis unsuitable?

It is unsuitable for early-stage categories that have not yet developed a stable structure—when the five forces are still taking shape, forcing ratings will only produce “confident noise.” The skill will explicitly flag that “the structure is still forming” and recommend conducting a market landscape scan first, then rerunning the analysis two quarters later. A complete analysis takes approximately 25–40 minutes. Before starting, it will ask no more than three questions—about the market segment, the decision to be supported, and the geographic scope. If these questions go unanswered, it will continue based on clearly labeled assumptions.