Ask any principal: “Is a class size of twenty students better than a class size of thirty students?” The answer you will probably get from most principals is, “Yes, absolutely!”—especially when class size impacts underperforming students and those who are struggling to meet conceptual and skills performance standards.
But then ask the question in a different way: “Would you rather have an experienced and proven master teacher teach a class of thirty students, or a less-than-stellar, not-meeting-the-instructional-quality-standards teacher instruct a class of twenty students?” You might get a different answer—and I know which option I would, and did, take.
As a high school principal, in organizing two departmental courses—9th-grade Algebra and 9th-grade English Language Arts—I placed my “weakest” students (based on transcript and 4th/8th-grade standardized testing scores) in classes of twenty with some of the strongest and most masterly skilled teachers; and I offset the cost by programming larger student class-size numbers in my advanced junior–senior-level classes and in my Advanced Placement (AP) courses.
So, I am the last to say that class size does not matter, because from a principal’s strategic vision to make it possible for all students to succeed in a system structured to only make a few entitled students academically successful, one of those leadership tools that must be used is to absolutely manipulate class size—and it works—as was reported in The New York Times (“Scores Count,” Sara Mosle, September 8, 1996), where a former student who was interviewed was from that coming-from-middle-school, underperforming and below-grade-level cohort; that student went on to take Physics and other advanced courses as a senior.
Therefore, strategically and contextually, class size will always matter, but it should never be considered a substitute for high-quality instruction and dedicated, efficacious practices.
This politically popularized, but pedagogically shallow and falsely binary, “either/or” framing of the class-size question is beneath serious professional debate and actively undermines the learning needs of real students in real schools. Well-informed policymakers and professional educators should instead be engaged in a rigorous, system-level conversation about how class size is deployed strategically—by different schools, grade band, subject area, academic course requirements (e.g., CTE classes), developmental psychology, student need, instructional capability strength, and the overarching school mission—across the entire PreK–12 continuum.
This standardized political approach of, “Well, we don’t know what to do, so let’s just do something that sounds right—and that we can sell to parents and taxpayers as if it will truly and significantly raise student academic achievement,” when in fact these chronically ineffective actions only succeed in wasting a great deal of money (millions) and squandering the precious learning windows of opportunity for thousands of children at all academic performance levels.
With every new mayoral change, the consultants, educational businesses, and those lobbying for someone other than children—who have no lobbyist—come out of the woodwork to “love bomb” and create a fog of confusion around the new mayor, all claiming that what they want (as opposed to what they really want and won’t say, which is a lucrative contract or more dues-paying members) is in the best interest of children, when what they want has no intention of helping children—especially those children in the city who will benefit the least, or not at all, from these expensive but useless initiatives.
Many (I won’t name them out of respect for the very dedicated employees involved) Title 1 school districts—destinations North, South, East, and West in our country—have some of the lowest class-size numbers in the nation; and yet these very high per-pupil-allocation districts don’t see their lower class sizes translate into higher academic-achievement performance, particularly for their most (usually the majority) politically disenfranchised children of color. We can’t blame this on direct racism, although an indirect neocolonial case could be made, because the primary governance officials—the local, state, and federal elected officials, and the district and school administrators—primarily share the same racial and cultural heritage as the vast number of chronically underreaching proficiency-level students. So, what’s up with that?
In the electoral-political sphere, it’s the economy (affordability); in public education, it’s the quality of instruction!
No school or school district (and the New York City Department of Education is technically a school district) can create significant, demonstrative, all-lives-changing, and sustainable high student academic performance—and I’m not talking about the press-kit fiddling with a few percentage-point “improvements” generated by averaging the higher-performing students with the lowest-performing students (like averaging my salary with Jeff Bezos’s salary and then calling me a multi-millionaire)—without establishing an extensive culture of high levels of instructional quality that the child receives year-grade after year-grade and when moving from class to class in middle and high schools.
I am hoping—and every speech I have heard from Zohran Mamdani suggests that my hope is not in vain—that he is smart enough to ignore the peddling pedagogical merchants who want to enrich themselves and not the educational experience of children. Many of these undereducated children are the very ones most in need of a high-quality public educational experience to break them out of a generational cycle of poverty and disappointment.
I am also betting my hope on the fact that two schools Mr. Mamdani attended, and that I visited several times—Bank Street School for Children and The Bronx High School of Science—were schools where the City’s elected officials, parents, school administrators, and the governing oversight bodies had little tolerance for a second-rate, not-properly-preparing-students-for-the-next-level, and terribly inferior educational learning climate. These two schools efficaciously did whatever it took to make their students successful.
Once, a NYC Specialized High School (SHS) principal colleague/friend called me about an African American teacher I was mentoring and had written a letter of recommendation for, who was now seeking a transfer from her present Manhattan high school to the SHS. The principal asked, “She is a great teacher, but does she know what she is in for?” The principal did not need to explain what that “what she is in for” statement meant, because I had already met with the teacher and had a keeping-it-real-honest conversation where I explained, “You will need to operate at your A+ level best every day of school, because those SHS parents are very politically connected, so there is no space for you to show up one day and think you could just ‘phone it in’ with these students” (not that I thought she ever would, but I wanted us to be clear-eyed about this SHS transfer she was seeking). And so, I explained that although she was technically tenured, no labor contract would protect her if she did not teach, as she now does, at a mastery level.
If Mayor-Elect Zohran Mamdani can simply focus on the types of schools he attended—schools that represented excellent, innovative instructional practices, high expectations for students, and an efficacious teaching model—as a standard offering for every NYC child, then the deceiving or misinformed “class size” whisperers will be ignored and will go away, allowing him to embark on an uncompromising pursuit of realizing school-system-wide instructional excellence.
If the new mayor truly wants system-wide quality learning, he must concentrate on the one policy lever that actually moves student achievement: sustained and high levels of instructional excellence in every classroom. That requires rejecting the fog of the fake “class size” misdirection war and instead embracing the school-cultural imperatives that guide places like the Bank Street School for Children, The Bronx High School of Science, and other NYC Specialized High Schools, and programs that demand, expect, and protect rigorous, next-level-preparing teaching every single day. Their leaders and parents do not tolerate weak instructional products, excuses, or adult-centered diversions, because they operate from a clear ethical directive: children deserve the best, and only the best, educational product we can provide.
If the mayor adopts that same standard for all of NYC’s children, the class-size-type distractions will fall away, the fog will lift, and the city can finally begin the urgent work of building a school system defined not by slogans or classroom seating gimmicks, but by real instructional excellence and authentic student success.
Michael A. Johnson is a former NYC public school teacher, award-winning principal, and school district superintendent. A past adjunct professor of science education and the author of two books on school-building leadership, he writes frequently about educational equity, policy, authentic school improvement, and the moral obligations of those entrusted with the lives of children.






