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REVIEWER FOR AIS WEEK 1 KAYA NIYO NA
Typology: Lecture notes
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Information Environment Information is a business resource. Internal and external information flow Internal Information Flow Horizontal flow - used at the operations level to capture transactional and operations data Vertical flow Downward flow – instructions, data, quotas Upward flow – aggregated transactions and operations External Information Flow Trading partners- Customer sales and company purchase information Stakeholders - Entities with direct or indirect interest in the firms Information requirement All user groups have unique information requirements Level of detail and nature of information System - group of multiple interrelated components or subsystems that serve a common purpose. Multiple components - contain more than one part Relatedness - common purpose relates the multiple parts of the system Purpose - A system must serve at least one purpose, but may serve several Subsystem – a system that is viewed in relation to a larger system which it Is a part Example: System decomposition - process of dividing the system into smaller subsystem parts System interdependency - all vital parts of a subsystem must be functioning well or the entire system will fail. Information system - set of formal procedures by which data are collected, processed into information, and distributed to users. Transaction - an event that affects or is of interest to the organization and is processed by its information system as a unit of work. 2 Classes of Transaction Financial transaction - Economic event that affects the assets and equities of the organization, is reflected in its accounts, and is measured in monetary terms. Non-financial transaction - Events that meet the residual definition of a financial transaction Accounting information system- an event that affects or is of interest to the organization and is processed by its information system as a unit of work Identifies, collects, processes, and communicates economic information
about a firm using a wide variety of technologies. It captures and records the financial effects of a firm’s transactions. Distributes transaction information to operations personnel to coordinate many key tasks. AIS subsystems process financial transactions and nonfinancial transactions that directly affect the processing of financial transactions. Management information system (mis) processes nonfinancial transactions that are not normally processed by traditional ais AIS Subsystems
2. Distributed data processing - ddp involves reorganizing it function into small information processing units (ipus) that are distributed to end users and placed under their control. Advantages Cost reductions in hardware and data entry tasks Improved cost control responsibility Improved user satisfaction Backup Disadvantages Loss of control Mismanagement of organization-wide resources hardware and software incompatibility Redundant tasks and data Consolidating incompatible activities Hiring qualified professionals Lack of standards Evolution of information system models 1. The manual process model- oldest and most traditional form of accounting systems. Physical events, resources, and personnel that characterize many business processes. Includes the physical task of record keeping. 2. Flat-file model (legacy system) - individual data files are not related to other files. data redundancy evident to the legacy system contributes to the following problems: Data storage Data updating Currency of information Task data dependency Limit data integration 3. Database model- centralizes the organization’s data into a common database that is shared by other users. With the organization’s data in a central location, all users have access to the data they need to achieve their respective objectives. 4. Rea model- resources are the assets of the organization. Events are phenomena that affect changes in resources. Agents are individuals and departments that participate in an economic event.
Assurance service: broader in scope than traditional attestation audit It auditors - evaluate it, often as part of external audit Internal auditors - in-house is and its appraisal services