![]() With timeboxing, the deadline is fixed, meaning that the scope would have to be reduced. Often both happen, resulting in delayed delivery, increased costs, and often reduced quality (as per The Mythical Man-Month principle). ![]() Without timeboxing, projects usually work to a fixed scope, in which case when it becomes clear that some deliverables cannot be completed within the planned timescales, either the deadline has to be extended (to allow more time to complete the fixed scope) or more people are involved (to complete the fixed scope in the same time). In project management, there are generally considered to be three constraints of time (sometimes schedule), cost (sometimes budget), and scope with quality often added as a fourth constraint (represented as the middle of a triangle), The assumption is that a change in one constraint will affect the others. Sometimes referred to as schedule as independent variable (SAIV). The schedule is divided into a number of separate time periods (timeboxes), with each part having its own deliverables, deadline and budget. ![]() Timeboxing is used as a project planning technique. ![]()
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