Final answer:
The missing fifth phase in the six-phase problem-solving procedure for examining and improving information systems is 'Systems implementation', and the professionals who utilize this procedure are known as 'Systems Analysts' or 'Information Systems Analysts'.
Step-by-step explanation:
The six-phase problem-solving procedure introduced in Chapter 12 for examining and improving an information system consists of Preliminary investigation, Systems analysis, Systems design, Systems development, Systems implementation, and Systems maintenance. In organizations, this procedure is used by computer professionals known as Systems Analysts or Information Systems Analysts.
These professionals employ a methodical and systematic approach to analyze, design, implement, and maintain information systems, ensuring they meet organizational needs and provide solutions to business problems. They also work on optimizing the performance and efficiency of existing systems. Understanding each phase is crucial for the successful development and management of a company’s information systems.