These are 3 Circle of Competence principles distilled from Philip Fisher's writing and public remarks. Use them as a decision checkpoint: translate each rule into a yes/no test, write what evidence would change your mind, and set a review date before you act. When a rule feels vague, open the full principle page and capture the driver you can verify (cash flows, leverage, incentives, competitive edge). This is educational, not investment advice—double-check primary sources and fit every rule to your time horizon, risk budget, and constraints.
"Talk to customers, suppliers, competitors, and former employees to build a complete picture of the company. This scuttlebutt method reveals what financial statements cannot."
Investigate companies through industry contacts.
Read Full Analysis →"Before investing, understand the industry thoroughly. Know the competitive dynamics, growth drivers, and technological trends that will shape the future."
Understand industries deeply before investing.
Read Full Analysis →"Visiting management is essential. You can learn more about a company in an hour of conversation with its management than in months of studying financial statements."
Meet management to assess quality firsthand.
Read Full Analysis →Use this page as a workflow, not a collection of quotes. Pick 3–5 principles, translate each into a concrete check, and review your decisions on a fixed cadence. These are educational guardrails—always verify facts and match them to your own constraints.
Rehearse a scenario decision → ·Run a weekly toolkit → ·Browse all principles →
Fisher is renowned for his "scuttlebutt" method of research – gathering information about companies by talking to customers, suppliers, competitors, and employees. This qualitative approach to understanding businesses complemented the quantitative methods prev…
Philip Fisher has 3 key principles on circle of competence. The most important one is "The Scuttlebutt Method" — Talk to customers, suppliers, competitors, and former employees to build a complete picture of the company.
Philip Fisher applies circle of competence through several key principles including "The Scuttlebutt Method" and "Deep Industry Knowledge". These principles guide practical investment decisions and have been tested across decades of market cycles.
Philip Fisher's approach to circle of competence is distinguished by a focus on long-term thinking and fundamental analysis. With 3 specific principles in this area, Philip Fisher provides a comprehensive framework that investors at any level can study and apply to improve their decision-making.
Treat each principle as a hypothesis. Write the evidence you would need, collect it from primary sources when possible (filings, letters, transcripts), and note what would invalidate the conclusion. If you can’t define inputs and triggers, you’re not applying the rule—you’re quoting it.
Pick a cadence you can sustain (weekly or monthly) and review process signals first: whether you followed your checklist, respected your boundaries, and documented assumptions. Only then look at outcomes. The goal is fewer low-quality decisions, not perfect prediction.
