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Insoftware engineering, afreeze is a point in time in the development process after which the rules for making changes to thesource code or related resources become more strict, or the period during which those rules are applied.^[1] A freeze helps move the project forward towards arelease or the end of aniteration by reducing the scale or frequency of changes, and may be used to help meet aroadmap.

The exact rules depend on the type of freeze and the particular development process in use; for example, they may include only allowing changes which fixbugs, or allowing changes only after thorough review by other members of the development team. They may also specify what happens if a change contrary to the rules is required, such as restarting the freeze period.Common types of freezes are:

• A (complete) specification freeze, in which the parties involved decide not to add any new requirement, specification, or feature to the feature list of a software project, so as to begin coding work.
• A (complete) feature freeze, in which all work on adding new features is suspended, shifting the effort towards fixingbugs and improving the user experience. The addition of new features may have a disruptive effect on other parts of the program, due both to the introduction of new,untested source code or resources and to interactions with other features; thus, a feature freeze helps improve the program's stability. For example: "user interface feature freeze" means no more features will be permitted to the user interface portion of the code; bugs can still be fixed.
• A (complete) code freeze, in which no changes whatsoever are permitted to a portion or the entirety of the program's source code. Particularly in large software systems, any change to the source code may haveunintended consequences, potentially introducing new bugs; thus, a code freeze helps ensure that a portion of the program that is known to work correctly will continue to do so. Code freezes are often employed in the final stages of development, when a particular release or iteration is being tested, but may also be used to prevent changes to one portion of a program while another is undergoing development. For example: "physics freeze" means no changes whatsoever will be permitted to the physics portion of the code.

In development environments usingversion control, the use ofbranching can alleviate delays in development caused by freezes. For example, a project may have a "stable" branch from which new versions of the software are released, and a separate "development" branch in which the developers add new code. The effect of a freeze is then to preventpromotion of some or all changes from the development branch to the stable branch. In other words, the freeze applies only to the stable branch, and developers can continue their work on the development branch.

• Feature complete
• Software release life cycle

• Software project management
• Software release

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