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Improv Comedy

Never say no to your scene partner: that single "Yes, and" rule powers improv, from Chicago's Second City to SNL.

By Greg Goodwin · Published October 3, 2026 · Updated October 24, 2026

Improv Comedy

Cheat Sheet

  • Improv comedy involves creating scenes, dialogue, and narrative entirely unscripted and in real time, often based on a single audience suggestion.
  • The 'Yes, and' principle — accepting a scene partner's idea and building on it — is widely considered improv's most foundational rule.
  • Chicago's Second City, founded in 1959, became one of the most influential training grounds for improv comedians, producing numerous Saturday Night Live cast members.
  • 'Short-form' improv consists of brief structured games (often with specific rules), while 'long-form' improv builds extended, loosely connected scenes exploring a theme.
  • The Harold, a long-form improv structure developed in the 1960s-70s, is considered one of the format's most influential and widely taught frameworks.
  • Improv training is increasingly used outside comedy entirely, including in corporate settings, to build adaptability, listening skills, and collaborative communication.

The 60-Second Version

Improv comedy involves creating scenes, dialogue, and narrative entirely unscripted and in real time, frequently built from nothing more than a single word or suggestion shouted out by the audience moments before the scene begins. Underlying nearly all improv training is the "Yes, and" principle, the foundational idea of accepting whatever a scene partner introduces and actively building on it rather than blocking or contradicting it, since contradiction can instantly collapse a scene that has no script to fall back on. Chicago's Second City, founded in 1959, became one of the most influential training grounds for improv comedians in the English-speaking world, producing a remarkable number of performers who went on to join Saturday Night Live and other major comedy institutions. The form itself splits into two broad styles: short-form improv, built from brief structured games with specific rules, often familiar to audiences through television formats, and long-form improv, which builds extended, loosely connected scenes exploring a single theme over a much longer stretch of stage time. One particularly influential long-form structure, known as the Harold and developed in the 1960s and 70s, remains one of the format's most widely taught frameworks for structuring an entire extended improv set. The core skills improv builds, like quick listening, adaptability, and genuine collaborative communication, have increasingly found use well outside comedy entirely, including in corporate training programs with no performance ambitions at all.

The Long Version

Comedy With No Script at All

Improv comedy involves creating scenes, dialogue, and narrative entirely unscripted and in real time, frequently built from nothing more than a single word or suggestion shouted out by the audience moments before the scene begins, a format that demands genuine in-the-moment creativity rather than rehearsed material.

The Rule That Makes It Work

Underlying nearly all improv training is the "Yes, and" principle, the foundational idea of accepting whatever a scene partner introduces and actively building on it rather than blocking or contradicting it, since contradiction can instantly collapse a scene that has no script or backup plan to fall back on if an idea gets rejected.

A Training Ground That Shaped Modern Comedy

Chicago's Second City, founded in 1959, became one of the most influential training grounds for improv comedians in the English-speaking world, producing a remarkable number of performers who went on to join Saturday Night Live and other major comedy institutions, cementing Chicago's improv scene as a genuine pipeline into mainstream comedy.

Short Games vs. Extended Scenes

The form itself splits into two broad styles: short-form improv, built from brief structured games with specific rules, the style most audiences recognize from television formats, and long-form improv, which builds extended, loosely connected scenes exploring a single theme over a much longer stretch of stage time without resetting between short bits.

A Framework Beyond the Stage

One particularly influential long-form structure, known as the Harold and developed in the 1960s and 70s, remains one of the format's most widely taught frameworks for structuring an entire extended improv set. Beyond comedy itself, the core skills improv builds, like quick listening, adaptability, and genuine collaborative communication, have increasingly found use in corporate training programs with no performance ambitions at all.

Why People Care

Improv comedy's emphasis on genuine collaboration and in-the-moment adaptability has influenced far more than stage comedy alone, and understanding its core principles explains both why it remains such a popular performance art and why its training methods have spread into entirely unrelated professional settings.

Glossary

Yes, and
A foundational improv principle of accepting a scene partner's idea and building on it, rather than blocking or contradicting it.
Second City
An influential Chicago improv theater and training ground, founded in 1959, that has produced numerous prominent comedians.
Short-form improv
Improv comedy built from brief, structured games, often with specific audience-driven rules or constraints.
Long-form improv
Improv comedy built from extended, loosely connected scenes exploring a theme, typically without the quick-game structure of short-form.
The Harold
An influential long-form improv structure developed in the 1960s-70s, widely taught as a foundational framework.

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