Thirdstage

Thirdstage is a term used across disciplines to denote the third phase of a multi-stage process. The precise content of the third stage depends on the field and the goals of the overall system.

In obstetrics, the third stage of labor is the interval from birth of the infant to the delivery of the placenta and membranes. This phase is typically several minutes in duration and is monitored to reduce the risk of postpartum hemorrhage; management may include controlled cord traction and uterotonic medications.

In rocketry and aerospace, the third stage is the uppermost propulsion segment of a multi-stage launcher, designed to place payloads into the desired orbit. It fires after the first and second stages have separated, and its performance governs orbital insertion accuracy and payload delivery.

In project management and software development, some frameworks describe a third stage such as verification or validation, testing, quality assurance, or release readiness, following initial development and integration. The exact definition varies by methodology and project context.

Some uses of the term as a proper noun include brands, bands, studios, or works titled Thirdstage. Because there is no single universally recognized entity by that name, references to Thirdstage typically require disambiguation.