Debbie Shen

Human performance is not simply a product of motivation or discipline. It emerges from interactions among biological health, cognitive functioning, emotional regulation, working conditions, and social environments.

Understanding these factors allows us to shift from maximizing short-term productivity toward developing sustainable, long-term capabilities.

1. The Science Behind Human Performance

Four disciplines offer valuable perspectives on how human performance functions.

Biology: Physical Capacity and Recovery

Sleep, nutrition, exercise, and physiological recovery directly influence our ability to function.

The Centers for Disease Control and Prevention (CDC) recommends that adults aged 18–60 obtain at least seven hours of sleep per night.

The World Health Organization recommends 150–300 minutes of moderate aerobic activity weekly, alongside muscle-strengthening activities at least twice a week.

These behaviors support physical health and provide an important foundation for cognitive performance.

Neuroscience: Attention and Cognitive Efficiency

The prefrontal cortex supports executive functions such as planning, attention, working memory, and decision-making.

Research indicates that excessive stress can impair prefrontal cortical functioning, making complex reasoning and emotional regulation more difficult.

This suggests that working longer does not necessarily mean working better. Cognitive performance depends on the quality of attention and opportunities for recovery, not merely the hours invested.

Occupational Psychology: Sustainable Productivity

The Job Demands-Resources model explains how high demands, insufficient resources, and limited recovery opportunities can contribute to exhaustion.

Sustainable performance requires balancing responsibilities with adequate resources, autonomy, feedback, and recovery.

Sociology: Environmental Influences

Performance does not occur in isolation. Workplace culture, economic circumstances, social expectations, and access to support influence individual outcomes.

Improving performance may therefore require changing our environment, not simply increasing personal discipline.

2. What Should We Actually Track?

A useful personal performance system should measure both achievements and the resources required to produce them.

I suggest monitoring five dimensions:

Dimension

Trackable indicators

Suggested tools

Physical health

Sleep duration, exercise frequency, resting heart rate, energy

Apple Health, Oura, Fitbit

Cognitive performance

Focused work hours, task completion time, errors, learning progress

Toggl Track, RescueTime

Psychological well-being

Stress, mood, mental fatigue, emotional recovery

Daylio, journal

Professional effectiveness

Work quality, deadlines, skill development, feedback

Notion, Excel

Social well-being

Social support, relationship satisfaction, personal boundaries

Weekly self-assessment

Not every variable needs to be measured continuously. A small set of meaningful indicators is often more useful than an overwhelming amount of data.

Wearable measurements, including heart rate variability and sleep-stage estimates, should be interpreted cautiously. They provide potentially useful trends but are not definitive assessments of health or recovery.

3. How to Build a Personal Performance Monitoring System

The most effective system is one that is simple enough to maintain.

Step 1: Establish a Baseline

For the first two weeks, observe your normal routines without attempting major changes.

Record a few indicators each day:

• Sleep: Total hours and perceived restfulness.
• Physical activity: Exercise type and duration.
• Cognitive performance: Focused work time and meaningful tasks completed.
• Psychological state: Stress and energy, rated from 1–5.
• Recovery: Whether you feel sufficiently refreshed to function the following day.

This initial period provides a reference point for evaluating future changes.

Step 2: Evaluate Performance Weekly

Spend 15 minutes reviewing your data.

Ask yourself:

1. Effectiveness: Am I producing meaningful, high-quality results?
2. Efficiency: Am I completing comparable tasks in less time or with fewer errors?
3. Sustainability: Can I maintain this performance without sacrificing physical or psychological health?
4. Growth: Am I developing skills and capabilities that increase my future potential?

A productive week accompanied by severe exhaustion may indicate high short-term output but poor sustainability.

Conversely, improved concentration, better recovery, and steady skill development may represent meaningful progress even when total working hours decrease.

Step 3: Adjust One Variable at a Time

Use your observations to identify opportunities for improvement.

For example:

Problem: Concentration consistently declines in the afternoon.

Possible explanations: Insufficient sleep, prolonged cognitive effort, environmental distractions, or inadequate breaks.

Intervention: Schedule demanding intellectual tasks earlier, introduce structured breaks, and protect sleep consistency.

Evaluation: Compare concentration, completed work quality, and fatigue over the following two to four weeks.

Changing one major factor at a time makes it easier to understand which adjustments may be beneficial, although everyday observations cannot establish causation with certainty.

4. How Do We Know We Are Improving?

Human performance naturally fluctuates. A single unproductive day does not demonstrate declining capability, just as one exceptionally productive day does not establish lasting improvement.

Instead, evaluate trends over several weeks or months.

Meaningful improvement may include:

• Completing increasingly complex work with greater accuracy.
• Learning new skills and retaining information more effectively.
• Maintaining stable energy and concentration throughout demanding periods.
• Recovering more effectively from physical and psychological stress.
• Achieving meaningful results without continuously increasing working hours.

True improvement occurs when our capabilities expand without consistently compromising our ability to recover and function well.

An increase in productivity accompanied by deteriorating sleep, chronic stress, or persistent exhaustion should prompt closer examination rather than automatic celebration.

5. The Long-Term Goal: Preserving Human Capacity

Ultimately, personal performance management should not become another source of pressure.

The goal is not to optimize every hour, eliminate every weakness, or transform ourselves into perfectly efficient individuals.

It is to develop enough self-awareness to recognize when to challenge ourselves, when to change strategies, and when to prioritize recovery.

Our bodies and minds are the foundations of everything we hope to accomplish. Protecting them is not separate from ambition; it is essential to sustaining it.

The most meaningful measure of performance is not how much we can accomplish today, but how effectively we preserve, renew, and expand our capacity to achieve throughout our lives.

Across every profession, countless individuals devote themselves to the pursuit of progress, innovation, and mastery. The competition for improvement never ceases, and neither does the human desire to become better. Yet this raises a fundamental question: What is excellence?

Where is its boundary? If perfection does not exist, then what ideal should we move toward? How should we evaluate our growth, judge our performance, and determine whether we are truly advancing?

Perhaps the pursuit of excellence begins with a realization: We are asking the wrong question. Rather than asking how close we are to perfection, which may be nonexistent, we should ask whether the systems guiding our decisions, habits, and learning are making us better than we were yesterday.

Excellence, then, is not a state of being. It is the product of a well-designed system for growth, refinement, and continuous adaptation.

1. What Is a System?

A system is a collection of interconnected components working together toward a desired outcome. These components can be people, processes, habits, incentives, tools, or decisions. What matters is not only the quality of each individual component but also how effectively they interact with one another.

When we look closely, nearly everything around us is a system. Organizations are systems. Teams are systems. Cities and societies are systems. Even our daily routines, learning habits, and career development can be viewed through a systems lens.

The effectiveness of any system depends on two factors: the quality of its parts and the strength of the relationships between them. Exceptional outcomes rarely come from a single outstanding component. More often, they emerge when many components work together in a coordinated and reinforcing way.

This explains why hiring matters, why culture matters, and why well-designed processes matter. A successful organization is rarely the product of one brilliant individual. Instead, it is the result of capable people operating within an environment that provides clear expectations, aligned incentives, effective communication, and efficient workflows.

When these elements reinforce one another, the system begins to support the people inside it. The better the system becomes, the easier it is for individuals to perform well. As individuals improve, they strengthen the system in return. This creates a positive feedback loop in which both the people and the system continuously elevate one another.

The same principle applies to personal growth.

Large achievements are rarely the result of isolated moments of effort. They are usually the accumulation of thousands of small decisions made consistently over time. Every action becomes a component of a larger system.

This is why details matter. A misspelled word in a report, an overlooked assumption in an analysis, a poorly defined responsibility within a team, or a small inefficiency in a workflow may seem insignificant on its own. Yet systems compound. Small errors accumulate into larger problems, while small improvements accumulate into extraordinary results.

Viewed this way, career growth is not simply about working harder. It is about intentionally designing a system that continuously produces learning, improvement, and high-quality outcomes. The goal is not to rely on motivation or occasional bursts of effort but to build a structure that makes excellence more likely over time.

A career, ultimately, is the output of the system behind it.

2. How to Build a Reliable System for Personal and Career Growth

If your career is a system, then your daily habits, skills, decisions, and relationships are its components. Improving the system does not require dramatic change overnight. It comes from continuously refining the fundamentals: writing more clearly, communicating more precisely, listening more attentively, learning more intentionally, and following through more consistently.

Over time, these small improvements compound.

Excellence is rarely the product of a breakthrough moment. More often, it is the result of systematically eliminating friction, strengthening weak links, and making incremental improvements year after year.

To build a reliable growth system, I find it useful to think about five interconnected dimensions. Together, they determine not only how quickly we grow but also how sustainable that growth becomes over time.

a) Knowledge and Expertise

This dimension represents what you know and how deeply you understand your field.

Expertise creates credibility. It allows you to make better decisions, solve more complex problems, and contribute at a higher level. As industries evolve, continuous learning becomes one of the most important career advantages.

b) Communication and Influence

Ideas only create value when they can be understood, trusted, and acted upon by others.

Many careers reach a point where technical expertise alone is no longer enough. The ability to explain complex concepts, align stakeholders, manage expectations, and influence decisions becomes increasingly important.

c) Execution and Productivity

Knowledge without execution produces little impact.

Execution is the ability to consistently transform intentions into outcomes. It is the bridge between planning and achievement. Strong execution creates trust because people know they can depend on your work.

d) Relationships and Network

No meaningful career is built entirely alone.

Opportunities often flow through relationships. Strong professional networks provide access to information, resources, guidance, collaboration, and new perspectives. More importantly, healthy relationships increase resilience during periods of uncertainty and change.

e) Health and Personal Sustainability

Every system has constraints. For human beings, health is often the most important one.

Career growth is difficult to sustain without physical energy, mental clarity, and emotional stability. High performance is not about maximizing effort every day. It is about maintaining the capacity to perform consistently over many years.

These five dimensions do not operate independently. Improvements in one area often strengthen the others.

Knowledge improves execution. Communication amplifies expertise. Relationships create opportunities. Health supports all four.

Viewed together, they form an integrated growth system. Weaknesses in one area can eventually limit performance in the others, while steady improvement across all five creates compounding results over time.

3. How to Improve Your System

Many people want to solve big problems, but improving a system often begins with asking a much simpler question:

"What detail am I overlooking?"

One lesson I've carried with me from studying actuarial science and risk management is that large failures are rarely caused by a single catastrophic mistake. More often, they originate from small errors that go unnoticed. A misplaced decimal, an incorrect assumption, or an overlooked variable can significantly alter outcomes.

The challenge is not paying attention to everything. No one can do that. The challenge is identifying the details that matter most.

The most valuable improvements usually come from addressing components that have a disproportionate influence on the system. A small adjustment to a critical process can save thousands of hours. A better hiring decision can shape a team's performance for years. A more accurate assumption can improve the reliability of an entire model. The highest-leverage details are often the ones connected to many other parts of the system.

This is why observation is such an important skill.

To improve a system, start by looking for recurring mistakes, persistent bottlenecks, and the workarounds people repeatedly create. These are rarely isolated issues. More often, they are signals that an underlying process, assumption, or structure needs attention.

Improvement happens when we stop treating symptoms and start identifying root causes.

Start small. Observe carefully. Improve continuously. Strengthen the components. Strengthen the system.

Because the quality of your outcomes will never consistently exceed the quality of the system that produces them. And the quality of your career will ultimately be determined by the systems you build within yourself.

4. How Does Your System Build Your Influence?

Many people view influence as a personal trait. They associate it with charisma, confidence, expertise, or leadership titles. While these qualities certainly matter, I've come to believe that sustainable influence originates from something deeper:

Your influence is ultimately a byproduct of the system you build.

A professional who relies only on personal effort can create results. A professional who builds systems can create results repeatedly, making them easier to track, observe, and improve. The difference may not be obvious at first, but over time, it becomes significant. Systems turn individual actions into consistent outcomes.

In a professional field, influence grows when your knowledge is documented rather than kept in your head, when your communication creates clarity instead of confusion, when your processes help teams work more effectively, and when your mentorship helps others develop their own capabilities. At that point, your value is no longer limited by the hours you personally contribute.

For women seeking to expand their leadership and professional impact, this distinction is especially important. Early career success often comes from proving your competence. Long-term influence comes from creating and being part of environments where others can succeed as well. The more you can transfer knowledge, develop talent, establish effective processes, and build strong professional networks, the greater your influence becomes.

A useful way to evaluate your influence is to ask: Are people making better decisions because of your guidance? Is work moving more smoothly because of systems you introduced? Are others growing faster because of your support? If the answer is yes, your impact is extending beyond your individual contributions.

Influence is not measured by how much work you can personally accomplish. It is measured by how much value continues to be created because of the systems you have built. When your ideas, habits, processes, and mentorship continue generating results even when you are not present, influence begins to compound.

The strongest professionals do not simply produce results. They build systems that make success repeatable for themselves and for others.

Conclusion

As professionals, we often spend years chasing excellence without stopping to define it.

We look at high performers and wonder how they became so exceptional. We focus on achievements, promotions, recognition, and visible success. Yet beneath nearly every remarkable career lies something less visible: a well-designed system.

Excellence is rarely a single accomplishment. It is the outcome of thousands of decisions, habits, relationships, and improvements working together over time.

Learn continuously. Communicate clearly. Build meaningful relationships. Protect your health. Share your knowledge. Create processes that make success repeatable. As these elements strengthen, the system strengthens. As the system strengthens, your performance, opportunities, and influence naturally expand.

For women seeking to grow their careers and leadership impact, perhaps the most important realization is this:

Success is what you achieve.

Influence is what you enable.

Excellence is the system that makes both possible.

The goal is not to become perfect. The goal is to build a system that makes you a little better today than you were yesterday and a little better tomorrow than you are today.

Over time, those small improvements compound into something remarkable.

Because in the end, we do not rise to the level of our ambitions. We rise to the quality of the systems we build. And the systems we build ultimately become the legacy we leave behind.