Explain four different changeover strategies. Are they mutually exclusive? In each of the following cases, suggest a changeover strategy. Explain its merits and drawbacks. Justify your choice by giving reasons why other strategies are not appropriate.

(a) A computerized inventory control system to replace antiquated manual methods. It is to be installed in eight warehouses and deals with 10,000 types of item.

(b) A major high street bank has commissioned an automated cheque and cash deposit system for its branches. It is to be operated by the bank’s counter personnel and will allow instant account updating for deposits.

(c) A new company has developed a computerized lottery system to be installed in lottery ticket offices throughout the country.