What term is used to describe a go-live strategy where all applications or modules are implemented simultaneously?

The term that describes a go-live strategy where all applications or modules are implemented simultaneously is known as "Big bang." This strategy involves deploying all components of the system at once, rather than in stages or phases. The big bang approach can be advantageous for organizations that want to minimize the time between the old and new systems, as it allows users to transition to the new system immediately without a prolonged transition period.

This strategy also integrates all parts of the system into a unified framework right from the start, which can enhance user experience by providing all features and functionalities at once. However, it carries significant risks, as any issues or failures in the implementation can impact the entire system and all users simultaneously, making problem resolution more complex.

Other terms related to system implementation, such as staged rollout, phased implementation, and simultaneous launch, reflect different approaches that involve more gradual transitions or specific scheduling but do not accurately capture the concept of implementing everything at once like the big bang method does.