Here are the explanations for the system conversion methods, information systems, database terms, and computer ergonomics: A) Pilot running Pilot running involves implementing a new system in a small, controlled part of an organization first. Once successful, it is then rolled out to the rest of the organization. Advantage: It allows for testing the new system in a real environment with minimal risk, as any problems are confined to a small group of users. B) Parallel running In parallel running, both the old and new systems operate simultaneously for a period. Users input data into both systems and compare outputs to ensure the new system is working correctly. Advantage: It provides a safety net, as the old system can still be used if the new system fails or has significant issues, ensuring business continuity. C) Direct changeover Direct changeover (also known as "big bang" or "plunge") involves immediately replacing the old system with the new system on a specific date. The old system is completely shut down. Advantage: It is the quickest and often the least expensive method of implementation, as resources are not spent maintaining two systems simultaneously. D) Phased implementation Phased implementation introduces the new system in stages or modules over time. Different parts of the system are implemented sequentially until the entire system is operational. Advantage: It allows users to gradually adapt to the new system and provides opportunities to make adjustments and learn from each phase before proceeding to the next. Q5) What is an information system? An information system (IS) is a set of interrelated components that work together to collect, process, store, and disseminate information to support decision-making, coordination, control, analysis, and visualization in an organization. B) Main components of a basic information system The main components of a basic information system are: Hardware*: The physical equipment used for input, processing, and output, such as computers, servers, and peripherals. Software*: The programs and applications that control the hardware and process data, including operating systems and application software. Data*: Raw facts, figures, and observations that are collected and processed by the system to produce information. People*: The users, operators, and developers who interact with the system and ensure its proper functioning. Processes*: The steps and procedures involved in collecting, storing, processing, and distributing information within the system. C) Three functions that determine the reliability of an information system Three functions that determine the reliability of an information system are: 1. Data Integrity: The accuracy, consistency, and trustworthiness of data over its entire lifecycle. A reliable system ensures data is not corrupted or lost. 2. Availability: The ability of the system to be accessible and operational when needed by authorized users. High availability means minimal downtime. 3. Security: The protection of the system and its data from unauthorized access, use, disclosure, disruption, modification, or destruction. A reliable system has robust security measures. B) Define the following terms as used in a database A) Primary key A primary key is a unique identifier for each record in a database table. It ensures that each row in the table can be uniquely identified and prevents duplicate records. B) Relational database A relational database is a type of database that stores and provides access to data points that are related to one another. It organizes data into one or more tables (or "relations") of rows and columns, with relationships defined between these tables. C) Database management system (DBMS) A database management system (DBMS) is software that allows users to define, create, maintain, and control access to the database. It acts as an interface between the database and its end-users or applications. D) Redundancy Redundancy in a database refers to the duplication of data, where the same piece of data is stored in multiple places within the database. While sometimes intentional for backup, it often leads to inefficiencies and potential inconsistencies. C) What is computer ergonomics? Computer ergonomics is the science of designing and arranging computer workstations, equipment, and environments to fit the user, aiming to maximize productivity while minimizing discomfort, fatigue, and injury. B) State and explain two physical health problems related to the use of computers Two physical health problems related to the use of computers are: 1. Carpal Tunnel Syndrome (CTS): This condition is caused by pressure on the median nerve in the wrist, often due to repetitive motions like typing or using a mouse. Symptoms include pain, numbness, and tingling in the hand and fingers. 2. Eyestrain (Computer Vision Syndrome): Prolonged focus on a computer screen can lead to symptoms such as dry eyes, blurred vision, headaches, and neck pain. This is often exacerbated by poor lighting, glare, or incorrect viewing distances.