“A chain is only as strong as its weakest link.”

Eliyahu M. Goldratt

1. Formulation and Essence of the Law

The Law of One Constraint (Law #7):

In any business system, at any given time, there is only one key constraint (the bottleneck), which determines the maximum productivity, speed, and throughput of the entire company.

When a company wants to grow by 1.5 to 2 times, most managers make the same mistake: they start pouring resources into already strong and well-understood areas. They purchase equipment, expand marketing, hire strong salespeople, and strengthen logistics.

If these improvements occur outside the key constraint, the result is zero or negative. Business is a single chain. Increasing capacity at any point except the bottleneck does not increase the system’s throughput. It only accumulates excess capacity in front of the bottleneck and increases the pressure on it.

The constraint will always exist. The challenge is not to fight this fact, but to consciously choose where it’s most profitable to be.

The Local Optimization Trap

The most dangerous illusion is to believe that if each department increases production by 20%, the company will grow by 20%.

When “well-fed” areas expand while the bottleneck remains the same, an imbalance arises. The queue at the constraint grows. People in strong departments begin to clash with those who “can’t keep up.” Money gets frozen in unfinished work.

In LAM terms, this creates significant hidden losses: the cost of expanding capacity that can’t be used, capital frozen in queues, and increased organizational friction between departments.

2. How to Apply

Business Case: A Company That Increased Sales While Customers Waited for Implementation

A B2B process automation company was actively expanding its sales and marketing department. We hired strong managers, increased our acquisition budget, and launched a new CRM. The number of signed contracts increased by 60% over six months.

Meanwhile, revenue remained virtually unchanged, while customer churn increased. The average time from contract signing to system launch increased from 3 to 7 weeks. Customers began terminating contracts even before implementation was complete.

System diagnostics based on the Law of One Constraint: sales and marketing were the strong points. The real constraint was the implementation team. It couldn’t handle the influx of new customers. Expanding sales only increased the queue at the bottleneck.

Solution (constraint logic):

1. Identified the constraint—the implementation team’s speed.
2. Maximized its use: removed all non-core tasks from the implementers and prioritized them based on customer value.
3. Subordinated the system to the constraint: sales received a limit on the number of projects that could be launched simultaneously.
4. Only then did we expand the constraint itself—hiring two strong implementers and standardizing typical scenarios.

Result: launch time reduced to 2.5 weeks. Churn during the implementation phase dropped to almost zero. Revenue began to grow proportionally to sales.

Personal Case: The CEO as a Bottleneck

The CEO of a growing IT company feels the organization is bogged down. He hires another VP of Marketing, buys an expensive CRM, and sends top executives to MBAs. Costs rise, productivity slows.

Analysis: The real bottleneck is himself. His habit of personally approving every key decision, every budget over a certain amount, and every creative project. New people and systems only increased the flow of requests to his desk. He’s strengthened everything except his own bottleneck.

3. Tool: LAM Audit of the Constraint

To find the real bottleneck and stop wasting money, ask three questions:

1. Where is the largest backlog of unfinished work (projects, applications, contracts, decisions) currently accumulating?

The point before the largest congestion indicates the bottleneck immediately behind it.

2. If the flow of incoming customers or orders were to double tomorrow, which department, person, or process would be the first to fail and block implementation?

This is the current constraint.

3. Are we investing in expanding functions that already have excess capacity relative to the bottleneck?

If so, we are increasing hidden losses.

4. Key Takeaway

The Law of One Constraint is the fundamental law of focus and investment discipline.

Any investment that isn’t focused on a constraint is a waste of capital. Strengthening strong areas while the bottleneck remains stagnant increases hidden losses.

Constraints must be managed, not fought. As soon as you expand the current one, it will move elsewhere. A leader’s job is to consciously choose where it’s most advantageous to be.

To take a company to the next level, it’s enough to focus on one key constraint and support two related processes. The rest is secondary.

Focusing on one constraint yields greater results than uniformly strengthening the entire system.

Ontological Passport (Brief)

Meta-thesis: The capacity of individual departments is a phenomenon. The system’s throughput, determined by the weakest link, is the essence.

Key law of dialectics: the transition from quantity to quality—increasing capacity beyond the constraint leads to a sudden drop in controllability.

Pair of categories: Essence – Phenomenon / Cause – Effect.

Hidden Loss: Costs of Unused Capacity, Maintenance of Excess Inventory, and Extended Lead Time.

October 2026

S. Filyanin