Day 288: 1,500 Decisions in 45 Minutes - The Hidden Expertise
- Brenna Westerhoff
- Dec 15, 2025
- 4 min read
"What's so hard about teaching? You just explain things to kids."
"Teachers get summers off and short days - easy job!"
"Anyone can teach if they know the subject."
These comments reveal complete ignorance of teaching's cognitive demands. So I counted. In one 45-minute lesson, I made approximately 1,500 decisions. Who to call on. When to reteach. Whether to address that behavior. How to phrase this explanation. Which example to use. Whether to speed up or slow down. Fifteen hundred micro-decisions that shape learning, and that's a typical lesson, not an exceptional one.
The decision density in teaching exceeds almost any other profession. Air traffic controllers make crucial decisions, but with seconds between them. Surgeons make life-or-death decisions, but in focused sequences. Teachers make educational, behavioral, social, and emotional decisions continuously, simultaneously, publicly, with thirty different outcomes to consider.
Interactive decisions dominate. Should I call on the struggling student who finally raised her hand, even though her answer might be wrong? Should I redirect the slightly off-task group or let them self-correct? Should I acknowledge that insightful comment now or save it for later? Each decision affects individual and group dynamics.
But here's what's invisible: most teaching decisions happen below conscious awareness. Experienced teachers aren't consciously deliberating these 1,500 choices. Their brains are processing information and generating responses faster than conscious thought. It's automated expertise that looks effortless but represents years of pattern development.
The multi-criteria decision-making is staggering. Every teaching decision balances multiple factors: learning objectives, individual needs, group dynamics, time constraints, emotional states, behavioral management, equity considerations. Calling on one student affects not just that student but everyone watching. Each decision ripples through multiple dimensions.
Pacing decisions alone are numerous. Speed up because they're getting it? Slow down because three students look confused? Skip the second example or add a third? These aren't just timing choices - they're learning trajectory decisions that affect comprehension for thirty different brains processing at different speeds.
The differentiation decisions are constant. Provide scaffolding for struggling students while challenging advanced ones. Adjust language complexity mid-sentence based on faces. Choose examples that connect to diverse backgrounds. Every utterance requires multiple simultaneous adjustments for different learners.
Behavioral decisions layer onto instructional ones. Address the whispered conversation or let it go? Move closer to the distracted student or maintain position? Use humor to redirect or firm reminder? These decisions happen while simultaneously making content decisions. It's parallel processing at its finest.
The emotional labor decisions are exhausting. Show disappointment at the poor effort or maintain encouragement? Express frustration at repeated mistakes or stay patient? Share excitement about content or maintain professional distance? Teachers make hundreds of emotional regulation decisions that affect classroom climate.
Assessment decisions happen continuously. Is this confusion productive struggle or need for intervention? Does that answer reveal understanding or lucky guess? Should I probe deeper or move on? Teachers assess constantly, not just during tests, making instructional adjustments based on continuous evaluation.
The equity decisions require vigilance. Am I calling on boys more than girls? Are my examples culturally inclusive? Is my pace privileging native English speakers? Every teaching decision has equity implications that conscious teachers track and adjust.
Language decisions are linguistically complex. Which vocabulary to use? How complex should sentences be? Should I use academic language or accessible language? Code-switch for different students? Every word is a decision about accessibility versus rigor.
The attention management decisions never stop. Notice the student doodling productively. Redirect the one doodling distractedly. Ignore the brief off-task moment. Address the persistent disengagement. Attention management requires continuous decisions about what to see and what to overlook.
Technology decisions add new layers. Use the digital tool or stick with analog? Allow phones for research or maintain ban? Integrate technology meaningfully or avoid digital distraction? Modern teachers make hundreds of technology decisions previous generations never faced.
The content decisions require deep knowledge. Which misconception to address first? What example best illustrates this concept? How much complexity to introduce? Content expertise enables split-second decisions about what to emphasize, explain, or eliminate.
Transition decisions affect flow. How long for this activity? When to shift gears? How to move from individual to group work? Smooth transitions require dozens of micro-decisions that maintain momentum while ensuring comprehension.
The improvisation decisions based on student responses are artistic. Build on that unexpected insight or return to plan? Follow the interesting tangent or maintain focus? Use that error as teaching moment or correct and continue? These decisions require instant evaluation of learning potential.
Safety decisions run constantly in the background. Physical safety, emotional safety, intellectual safety. Is that joke harmless or hurtful? Is that challenge productive or damaging? Will this activity include everyone? Teachers are safety managers making hundreds of protective decisions.
The cumulative cognitive load is crushing. Fifteen hundred decisions in 45 minutes, then repeat for the next class. Different students, different dynamics, another 1,500 decisions. By day's end, teachers have made more decisions than most professionals make in a week.
Tomorrow, we'll explore the creative destruction of perfect lessons. But today's recognition of teaching's decision density is crucial: teaching isn't explaining content to passive recipients. It's making thousands of micro-decisions that shape learning experiences for diverse humans. When people say teaching is easy, they're seeing the visible tip of an invisible iceberg of expertise. Those 1,500 decisions in 45 minutes? That's not a job - that's professional artistry at the highest level.