Which of the following is NOT a type of system conversion?

The correct choice highlights that sequential conversion is not recognized as a standard type of system conversion. In the context of system conversion, there are established methods used to transition from an old system to a new one.

Phased conversion involves gradually replacing old systems with new ones in parts, allowing for a more manageable transition. Direct conversion entails a complete switch from the old system to the new one at a specific point in time, which can be risky but often results in immediate adoption of the new system. Parallel conversion runs both the old and new systems simultaneously for a certain period to ensure the new system is functioning correctly before completely transitioning.

In contrast, sequential conversion is not an established method within the common frameworks of system conversion techniques used in information systems and development projects. This distinction makes it clear why sequential conversion does not fit alongside the other recognized types.