If This Is True What Else Is True

At the heart of the iO Chicago tradition lies a deceptively simple question that has shaped how improvisers build scenes for decades: if this is true, what else is true? The phrase encapsulates a scene-building philosophy that guides performers to explore the logical implications of their premises rather than merely repeating or escalating a single comedic idea. When a character reveals something about themselves, their world, or their relationships, this principle asks the ensemble to follow that thread outward, discovering what other truths must exist in a universe where that initial premise holds.

The concept emerges from the long-form improv tradition pioneered at iO (formerly ImprovOlympic) under Del Close and Charna Halpern. Close's approach to The Harold and other long-form structures emphasized that comedy and truth arise not from joke-telling but from honest exploration of premises. Rather than treating a funny moment as a punchline to be topped, performers trained in this tradition learn to treat it as a doorway. If a character is afraid of his own shadow, the question becomes not "how can we make the shadow scarier?" but "what kind of person lives in terror of something so harmless?" Perhaps he avoids sunlight entirely. Perhaps he has developed an elaborate system of indoor lighting. Perhaps his relationships suffer because he cannot walk beside anyone on a sunny day. Each discovery opens further avenues for exploration.

This approach represents what improvisers call lateral heightening, as distinct from linear heightening. Linear heightening takes a single element and intensifies it: the shadow gets bigger, darker, more menacing. Lateral heightening expands the world by asking what other behaviors, beliefs, or circumstances would logically accompany the established premise. The result is a richer, more detailed scene that feels grounded in internal logic rather than built on increasingly absurd repetition.

In teaching, coaches often introduce this concept by having students practice "if/then" chains. A premise is established, and the ensemble brainstorms what else must be true in that world. The exercise trains improvisers to think associatively but logically, building connections that surprise the audience while still feeling inevitable. Coaches frequently remind students that the strongest choices are those that feel like discoveries rather than inventions, as if the truth was always there waiting to be found.

A common pitfall occurs when performers treat the question too literally or narrowly, generating a list of disconnected observations rather than building a coherent world. The goal is not to catalog every possible implication but to find the implications that deepen understanding of character, relationship, or situation. Another frequent mistake is abandoning the original premise too quickly in pursuit of new territory; the concept works best when each new truth remains tethered to the foundational reality of the scene.

The principle connects closely to several other core improv concepts. It shares DNA with "yes, and" in that both require acceptance and addition, but "if this is true, what else is true" specifically directs the addition toward logical consequence rather than free association. It serves as a practical mechanism for finding "the game of the scene," helping performers identify and explore the unusual thing about their scene's reality. It also relates to the concept of "playing to the top of one's intelligence," since following implications requires genuine thought and attention rather than reflexive comedic instinct.

The question has become one of the most widely taught tools in modern improv pedagogy, used across traditions well beyond iO Chicago. Its power lies in its simplicity: it gives performers a concrete, repeatable mental action to take in the moment, transforming the overwhelming openness of an unscripted scene into a series of manageable, logical steps.