Discuss the changeover and data entry strategies that could be applied to the following cases:

(a) A small company is implementing a simple 2D computer aided design (CAD) system. Previously, all draughting was manual. Roughly ten new drawings are created per week. The company has over 10 000 paper-based drawings.

(b) A large healthcare company has 25 hospitals. The current systems for storing patient records is based on a central mainframe computer. These patient records are amended frequently and thus transaction rates are very high. It is critical the system is available at all times. The company plans to decentralize systems with each hospital having its own independent mini-computer based systems.