Process Modeling Objectives:

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● Process Modeling
● Models: Logical and Physical
● Why Logical System Models
● Process Modeling and DFDs
● Differences Between DFDs
and Flowcharts
● External Agents
● Data Stores
● Process Concepts
● The System is Itself a Process
● Process Decomposition
● Types of Logical Processes
● Common Process Errors on DFDs
● Data Flows & Control Flows
● Data Flow Packet Concept
● Composite and Elementary
Data Flows
● Data Flows to and from Data Stores
● Rules for Data Flows
● Data Conservation
● Data Structures
● Data Structure for a Data Flow
● Data Structure Constructs
● Data Structure Constructs (continued)
● Data Structure Constructs (concluded)
● Data Types and Domains
● Diverging and Converging
Data Flows
● When to Draw Process Models
● Classical Structured Analysis
Rarely practiced anymore because cumbersome & time-consuming
● Modern Structured Analysis
(More Commonly Practiced)
● Structured Analysis Diagram Progression (1 of 3)
● Structured Analysis Diagram Progression (2 of 3)
● Structured Analysis Diagram Progression (3 of 3)
● Our DFD Approach
● CASE for Process Modeling
● Context Data Flow Diagram
● SoundStage Context DFD
● SoundStage Functional
Decomposition Diagram
● Events and Use Cases
● SoundStage Partial Use Case List
● SoundStage Partial
Event Decomposition Diagram
● Event Diagrams
● Simple Event Diagram
● Event Diagram (more complex)
● Temporal Event Diagram
● Complete System DFD
● Balancing
● Primitive Diagrams
● Primitive DFD
(see book for more readable copy)
● Specifying a Data Flow Using a CASE Tool
● Process Logic
● Problems with Natural English
● Structured English
● Structured English Constructs (Part 1)
● Structured English Constructs (Part 2)
● Structured English Restrictions
on Process Logic
● Policies and Decision Tables
● A Simple Decision Table
● Data & Process Model Synchronization CRUD Matrix
● Process Distribution

نوع زبان: انگلیسی حجم: 4.04 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 62 صفحه
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., model, process, system, datum, external, logical, dfd, agent, flow, business, –,

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: ., model, process, system, datum, external, logical, dfd, agent, flow, business, –,

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process modeling objectives define systems modeling and differentiate logical and physical models. define process modeling and explain its benefits. recognize and understand basic concepts and constructs of a process model. read and interpret a data flow diagram. explain when to construct process models and where to store them. construct a context diagram to illustrate a system’s interfaces with its environment. identify use cases external and temporal business events. perform event partitioning and organize events in a functional decomposition diagram. draw event diagrams and merge them into a system diagram. draw primitive data flow diagrams and describe the elementary data flows in terms of data structures and procedural logic. document the distribution of processes to locations. synchronize data and process models using a crud matrix. chapter ۹ objectives. teaching notes this slide shows the how this chapter s content fits with the building blocks framework used throughout the textbook. the emphasis of this chapter is upon processes. it also reflects the fact that process modeling may be performed during certain analysis phases and involves not only systems analysts…but owners and users. models logical and physical logical model – a nontechnical pictorial representation that depicts what a system is or does. synonyms or essential model conceptual model and business model. physical model – a technical pictorial representation that depicts what a system is or does and how the system is implemented. synonyms are implementation model and technical model. model – a pictorial representation of reality. just as a picture is worth a thousand words most models are pictorial representations of reality. teaching notes in some books the term logical is called a conceptual or essential. the term essential comes from the notion that the model represents the essence of the system. for database oriented instructors the term logical in the world of systems analysis is not equivalent to the term logical in the world of database. in the database world a logical schema is already constrained by the choice of a database technology which runs contrary to the systems analysis expectation that a logical model is technology independent. in some books the term physical is called implementation or technical. emphasize that there are nearly always multiple technical solutions for any given set of business requirements. in most projects there is one logical model that represents the mandatory and desirable business requirements regardless of how those requirements might be implemented. on the other hand given that one logical model there are multiple candidate physical models that could represent alternative technical implementations that could fulfill the business requirements although analysts rarely draw more than one or two of those physical models . why logical system models logical models remove biases that are the result of the way the system is currently implemented or the way that any one person thinks the system might be implemented. logical models reduce the risk of missing business requirements because we are too preoccupied with technical results. logical models allow us to communicate with end users in nontechnical or less technical languages. no additional notes process modeling and dfds process modeling – a technique used to organize and document a system’s processes. flow of data through processes logic policies procedures data flow diagram dfd – a process model used to depict the flow of data through a system and the work or processing performed by the system. synonyms are bubble chart transformation graph and process model. the dfd has also become a popular tool for business process redesign. teaching notes many if not most students have drawn or seen process models in the form of program flowcharts. unfortunately flowcharts are control flow process models as opposed to data flow process models. this can cause some students trouble because they want to illustrate structured flow of control nonparallel processing in their early dfds. most introductory information systems books at least introduce with one or two examples dfds. differences between dfds and flowcharts processes on dfds can operate in parallel at the same time processes on flowcharts execute one at a time dfds show the flow of data through a system flowcharts show the flow of control sequence and transfer of control processes on a dfd can have dramatically different timing daily weekly on demand processes on flowcharts are part of a single program with consistent timing no additional notes external agents external agent – an outside person unit system or organization that interacts with a system. also called an external entity. external agents define the boundary or scope of a system being modeled. as scope changes external agents can become processes and vice versa. almost always one of the following office department division. an external organization or agency. another business or another information system. one of system’s end users or managers named with descriptive singular noun gane and sarson shape demarco yourdon shape teaching notes it is very important to emphasize the external agents on dfds are not the same as entities on erds from chapter ۷ —especially if the instructor prefers the more traditional term external entity. this is true even though you could have both an entity on an erd with the same name as an external agent entity on a dfd. consider the entity customer and the external agent customer the entity customer indicates the requirement to store data about customers. the external agent customer indicates the requirement for an interaction inputs and or outputs with customers. it is very important for students to understand that external agents are processes outside of the scope of the system or business. as such as scope increases external agents can become processes. conversely if scope decreases processes can become external agents. data stores data store – stored data intended for later use. synonyms are file and database. frequently implemented as a file or database. a data store is data at rest compared …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: ., model, process, system, datum, external, logical, dfd, agent, flow, business, –,

این فایل پاورپوینت شامل 62 اسلاید و به زبان انگلیسی و حجم آن 4.04 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/05/17 07:10:34 استخراج شده است.

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