Presentation on theme: "Business Processes, Data Modeling and Information Systems"— Presentation transcript:
1Business Processes, Data Modeling and Information Systems Chapter 1Business Processes, Data Modeling and Information Systems
2Learning ObjectivesIdentify entities and relationships in a business processIdentify resources, events and agents (REA) in a business processEvaluate and determine the cardinalitiesModel a company’s business processes using an REA diagram
3Legacy versus Modern AIS Legacy accounting information systemsFlat files with disconnected subsystemsModern accounting information systemsUse database approach that emphasizes the integration and sharing of data across major functional areasDesigned based on a company’s business processesEvent-driven based upon business processes
4What is Data Modeling?The process of creating a logical representation of the structure of a database based on a company’s business processesThe most important task in the development of an effective database is to provide useful information
5Entity-Relationship Diagram Entity-Relationship Diagram (ERD) is a commonly used business data modeling technique.The ERD uses a graphical representation to identify and document various entities and the relationships between those entities.Three major components of an ERD are the entity, the relationship, and the attribute.
6ERDAn entity is anything about which a company would like to collect and store information.Example: inventory, purchase, vendor, etc.It is represented using a rectangle.A relationship is an association between entities.Example: one-to-one, one-to-manyIt is represented using a diamond.An attribute is a characteristic of an entity, such as the inventory number and the description of each item in the entity of “inventory.”
7Resource-Event-Agent (REA) Diagram REA diagram is a framework specifically designed for building accounting information systems in a shared data environment based on the ERD technique.Components in an REA diagram:Resources: Things that have economic value to a company, such as cash and inventory.Events: Various business processes conducted in a company’s daily operations, such as sales and purchases.Agents: People and organizations, such as customers and salespeople, who participate in business events.
8REA DiagramA general rule: each economic event should be linked to at least one economic resource and two economic agents.The relationship shown between the two economic events is referred to as an economic duality relationship. The causal relationship occurs as a result of a give and a take happening.
10Transaction Cycles and REA Modeling The transaction cycles are combined into an REA model to create the entire accounting information system (see Figure 1-3).This high-level conceptual model indicates how the transaction cycles interact with each other and with the financial reporting system.
14CardinalitiesThe number of instances one entity can be linked to one specific instance of another entity.Restricts the number of participation constraints in a relationship.A cardinality is denoted as (min,max) where min is the minimum number and max is the maximum number that can participate in a relationship.
17Using REA to Model Business Processes Three basic steps to construct an REA diagram to depict a company’s business processes:Identify economic exchange events.Identify the resources affected by each economic event and the agents who participate in those events.Determine the cardinalities of each relationship.After the business processes are modeled, the REA diagram should be validated by the company’s experts who are knowledgeable about the details and the objectives of the business processes.
18Sales-Cash Receipt Relationship (E-E) Identify economic exchange events in the cycle
19Basic REA Diagram for Cherokee’s Revenue Cycle Identify the resources affected by each economic event and the agents who participate in those eventsAgentsResourceEvents
20Cash-Cash Receipt Relationship (R-E) Determine the cardinalities of each relationship