A fixed budget of athletes and events
The programme is not an open list. Each edition works within limits on the total number of athletes and the number of events, because venues, villages and schedules are finite. That constraint is what makes programme decisions genuinely contested: adding a discipline usually means reducing another, tightening a quota, or trimming events elsewhere in the same sport.
It also explains why an addition often arrives in a compact form. New entries tend to appear with small fields, mixed-gender formats or short competition windows, because those cost fewer athlete places than a full traditional bracket.
Core sports and host proposals
A group of sports has been on the programme continuously and is treated as its backbone. Around that core, the host city can propose additional sports for its own edition, which is how the programme has come to vary from Games to Games rather than being fixed for decades at a time. A sport added this way is not permanently included: the next host may not propose it.
Proposals are assessed on more than audience. Global participation, the strength and integrity of the international federation, anti-doping compliance, gender balance, venue requirements and youth appeal all appear in the reasoning. A popular sport with weak governance is a poor candidate, and a well-governed sport confined to a few countries is a poor candidate for different reasons.
The Winter programme works to the same logic on a smaller scale, with the additional constraint that events need snow, ice and terrain, which limits both hosts and additions far more than the Summer Games are limited.
Why sports leave
Removals are usually structural rather than punitive. A sport may lose its place because its global participation is narrow, because its venue demands are disproportionate, because its federation has failed a governance or anti-doping review, or simply because the athlete budget has to be found somewhere for an addition the host wanted.
Disciplines within a sport churn more quietly than whole sports do. Events are swapped for shorter or mixed variants, distances are adjusted and relays are added, often to improve gender balance without increasing the athlete count. Most programme change happens at this level and attracts almost no attention.
The result is a programme that reads like an accumulation of decisions rather than a design — which is exactly what it is, and why the list of Olympic sports has never been stable for long.