Schools Are Getting Smaller. Is That Actually Bad for Your Child?

The instinct is universal and understandable: smaller class, more teacher attention, better outcomes. It has the logic of simple arithmetic behind it. One teacher, twenty students — each child gets five percent of the teacher's time. One teacher, thirty students — each child gets three percent. The case seems to close itself.

The research is considerably less tidy than that arithmetic.

I want to work through what the evidence actually says, and then I want to separate that question — which is about class size in an otherwise stable school — from the different and more practically relevant question that many Hong Kong families face right now: what happens to a child in a school that is shrinking under demographic pressure?

These are not the same question, and the answers point in different directions.

What the Research Actually Says About Class Size

The most rigorous evidence on class size comes from the Tennessee STAR study, a large randomised experiment in the 1980s that assigned students to classes of 13-17 students versus 22-26 students from kindergarten through third grade. The smaller class students performed better, and the effect was larger for disadvantaged students than for advantaged ones. This study is frequently cited as proof that smaller classes work.

It is also frequently over-cited. The STAR study found meaningful effects at sizes below 17 — that is, genuinely small classes. The comparison was not between 25 and 28 students; it was between 15 and 24. Most class size debates in Hong Kong are operating in a range where the STAR findings do not directly apply. A class of 30 versus a class of 25 is not the comparison that study was measuring.

More recent meta-analyses have found that class size effects are real but modest, and that they are substantially dependent on what teachers do with the additional space that smaller classes provide. A skilled teacher who changes their practice in a class of 22 — who uses the smaller group for Socratic discussion, who provides more individual feedback, who monitors formative understanding more closely — gets real gains. A teacher who teaches exactly the same lesson to 22 students that they taught to 32 students gets very little.

The honest summary is this: class size matters at the margins, particularly for young children and for disadvantaged learners, and the effect is real but smaller than popular belief suggests. It is also highly dependent on teacher quality and pedagogical practice, which class size data alone cannot capture.

What School Shrinkage Actually Does

Here is where the conversation gets more practically relevant to what is happening in Hong Kong right now.

When I talk about class size research, I am talking about deliberate policy decisions to reduce class sizes while keeping everything else stable — funding, staff, facilities, curriculum. That is not what happens when a school shrinks under enrolment pressure. When a school loses a third of its students over five years because the local demographic is declining, what follows is not equivalent.

The real effects of school shrinkage under demographic pressure are more complicated, and some of them run directly against the "smaller = better" intuition.

Specialist teacher loss. A school running four Form One classes can justify a full-time Drama teacher, a Music specialist, a qualified PE staff member for each year group. A school running two Form One classes cannot. The economics mean that specialist posts are the first to be consolidated, shared across schools, or eliminated. The child in the shrinking school ends up with more contact with the same core teachers and less access to specialist instruction. That is a real loss, and it is not offset by slightly smaller classes.

Extracurricular reduction. This one is painful and concrete. The inter-school basketball competition, the debating team, the Model United Nations, the school musical — all of these require a critical mass of students to function. A school of 400 can field a competitive chess team. A school of 160 often cannot. Extracurricular activities are not extras in a secondary school context; they are often where children develop team skills, leadership, and the specific experiences that appear on university application personal statements.

Peer learning and group dynamics. This is underappreciated. Students learn significantly from each other. A Form Two class of 30 contains a range of children who bring different knowledge, experience, and perspectives. The high-performing child who explains a concept to a peer, the collaborative group project, the class discussion that pulls in unexpected contributions — all of these are functions of having a sufficiently diverse and numerous peer group. A class of 12 in a school that is struggling is not necessarily providing a richer learning environment; it may be providing a thinner one.

Staff morale. I will say this plainly because I have seen it: a school that knows it may not survive the next three years has a staffing problem. The most capable teachers have options. A school under serious enrolment pressure tends to lose its best teachers to more stable institutions, and it tends to have difficulty recruiting strong new staff. Low morale is contagious in a teaching environment. Children pick it up even when adults try to conceal it.

The Real Benefits of Smaller Schools

I do not want to paint entirely in one direction, because the evidence on smaller schools has positive findings too.

Children in smaller schools — genuinely small schools that are designed to be small, not schools that have shrunk — tend to know more of their teachers personally, and more of their teachers know them. This relational dimension matters. Research on adolescent wellbeing consistently shows that feeling known and recognised by adults in the school environment is protective, particularly through the secondary years. A child who is visible to staff — not invisible in a large cohort — has a better chance of having problems noticed early.

Smaller schools also tend to have stronger community cultures. The parents know each other. The Form Five students know the Form One students by name. Events feel like events rather than logistics exercises. If your child is the kind of person who thrives in that kind of environment — and some children absolutely do — a smaller school is not a compromise.

The key distinction is between a school that is small by design and vision versus a school that is small because it is declining. These look superficially similar and feel very different from inside.

How to Evaluate This for Your Specific Child

There is no universal answer here, and any article that pretends there is one is misleading you.

A child who is introverted, who finds large social environments exhausting, who has one or two strong friendships rather than a wide social network, may genuinely flourish in a smaller, tighter-knit school even if it means fewer extracurricular options. A child who thrives on variety, who needs competitive peers, who wants to be in a debating team and a swimming squad and the school orchestra, needs a school with the critical mass to support all of that.

Before you evaluate the size of a school, evaluate what your child actually needs. Then look at whether the school in question is small by design or by default. Talk to current parents about staff morale. Look at the extracurricular offering over the past three years — is it stable, growing, or contracting?

The demographic changes in Hong Kong's school system are real and they will continue for several more years. But the story is not simply "smaller schools are worse." The story is more specific: schools that are shrinking under demographic pressure face real structural challenges that smaller classes alone do not offset.

Pay attention to the structure, not just the size.