What is the term for a significant change that alters the way something is done?

The term "revolution" is used to describe a significant and often rapid change that fundamentally alters the way something is done, whether in a societal, political, or technological context. It typically implies a complete and dramatic transformation, moving away from previous methods or practices in a way that creates a new system or paradigm.

In this context, the other words have different connotations. "Evolution" refers to a gradual process of change, often implying slow and incremental development rather than a sudden and radical shift. "Reformation" usually suggests improvement or change within an existing structure, often in a more moderate and reformative manner rather than a comprehensive overhaul. The term "revolutionary," while related to "revolution," describes something that supports or advocates for revolution rather than designating the act of significant change itself.

Thus, "revolution" is the correct choice, as it captures the essence of a profound shift in practice or methodology.