The rule of 3 in consulting is a communication and problem-solving framework that organizes ideas, arguments, or recommendations into three distinct, logical buckets to enhance memory retention, persuasion, and clarity for clients. It simplifies complex information by focusing on the three most critical points or, as often used at McKinsey & Company, three supporting reasons for a recommendation.
McKinsey Consulting
The Rule of 3 is a rule of thumb for executive communication. Whenever you're trying to persuade a senior person to do something, always present 3 reasons. Not 2, not 4, but exactly 3.
He posited that a “sta- ble, competitive” industry will never have more than three significant competitors. Moreover, that industry structure will find equilibrium when the market shares of the three companies reach a ratio of approximately 4:2:1.
Some consultants choose a triple rate because of what they call the rule of thirds — one third goes to your real wage, one third to expenses, and one third to administration, low utilization and bad debt. It's pretty easy math, which is also a reason it's popular.
McKinsey & Company, Boston Consulting Group, and Bain & Company, collectively referred to as "MBB", are widely considered the three top and most prestigious strategy consulting firms in the world.
Four Pillar Consulting derives its name from the concept of strength and stability, with each pillar representing a core value: Health, Safety, Quality, and the Environment. Together, these pillars form a solid foundation that enables businesses to thrive and succeed.
While both of these groups are great places to work, MBB edges out the Big Four in most of the metrics we have used: prestige, pay, training & learning, exit opportunities, and so on. Thus taking the information into account, you should apply for the group that suits you most.
The “rule of thirds” rules all.
At any given stage of the buying journey, one-third of customers hope for in-person interactions, one-third want remote communications, and one-third prefer digital self-serve options.
The Rule of 72 is a quick formula that estimates how long it takes for money to double, whether it's an investment or a debt. The calculation is simple: 72 ÷ annual interest rate (%) = number of years for money to double.
The median Consultant daily rate in London is £575, according to job vacancies posted in the 6 months leading up to 15 January 2026.
Stars: Products with high market growth and a high market share. Dogs: Products with low market growth and a low market share. Cash cows: Products with low market growth but a high market share.
Michael Porter identifies three flavors of strategy: (1) cost leadership, (2) differentiation, or (3) focus of cost leadership or differentiation on a particular market niche. Firms can straddle these strategies, but such straddling is likely to dilute strategic focus.
The "BCG five pillars" generally refer to Boston Consulting Group's (BCG) core purpose principles: "Bring Insight to Light," "Conquer Complexity," "Drive Inspired Impact," "Lead, with Integrity," and "Grow by Growing Others," which guide their consulting and company culture. However, the term can also relate to BCG's frameworks for specific areas, such as five components for performance management (KPIs, taxonomy, dashboards, etc.) or five strategy types in their Strategy Palette (Classical, Adaptive, Visionary, Shaping, Renewal).
If you want to appear knowledgeable or otherwise prepared in a job interview and not embarrass yourself, try to know at least three different facts about anything that you claim to have knowledge of—whether you are the one being interviewed or doing the interviewing.
The table below shows the present value (PV) of $50,000 in 20 years for interest rates from 2% to 30%. As you will see, the future value of $50,000 over 20 years can range from $74,297.37 to $9,502,481.89.
Elevator Test - Know your solution (or your product or business) so thoroughly that you can explain it clearly and precisely to your client (or customer or investor) in 30 seconds. If you can do that, then you understand what you're doing well enough to sell your solution.
Here's one pro-tip that I learned from one of my mentors at McKinsey: The Rule of 3. Whenever you're trying to persuade a senior person to do something, always present 3 reasons. Not 2, not 4, but exactly 3.