System Analysis And Design Lecture Notes Ppt

System Analysis And Design Lecture Notes Ppt – Explain Joint Application Development (JAD), Rapid Application Development (RAD) and Agile methods. Use a Functional Decomposition Diagram (FDD) to model business functions and processes. Describes the Unified Modeling Language (UML) and examples of UML diagrams.

List and describe system requirements, including outputs, inputs, processes, performance, and controls. Explain the concept of scalability. Use fact-finding techniques such as interviews, document review, observation, questionnaires, sampling, and research. Define Total Cost of Ownership (TCO) Conduct a successful interview. Develop effective documentation methods for use during systems development

System Analysis And Design Lecture Notes Ppt

Understand the proposed design Ensure it meets business requirements Build a solid foundation for system development System Analysis Activities Requirements Data and Process Modeling Data Modeling Object Modeling Development Strategies

System Analysis And Design Notes)

Requirements modeling Research to describe the current system Requirements for the new system Data and process modeling Graphically representing system data and processes Object modeling Creating objects to represent things, transactions and events Development strategies Software trends, development alternatives, outsourcing, etc. FIGURE 4- 2 The systems analysis phase consists of requirements modeling, data and process modeling, object modeling, and consideration of development strategies. Note that systems analysis tasks are interactive, although the waterfall model generally describes sequential development

Systems analysis skills Strong analytical skills Interpersonal skills Team-based techniques: JAD, RAD and Agile methods The goal is to deliver the best possible system at the lowest possible cost in the shortest possible time. uses a condensed version of the system development life cycle. Agile methods emphasize intensive interaction between developers and users

Bring users into the development process as active participants. User involvement (formal or informal) created a successful system Participants and roles JAD project leader and one or more members Participants isolated from the distractions of daily operations

Disadvantages of JAD JAD is more expensive than traditional methods Can be complicated if the group is too large Advantages of JAD JAD allows key users to participate effectively. Users are more likely to feel a sense of ownership. Produces a more precise statement of system requirements.

Chapter 4 Systems Analysis

Uses a group approach like JAD JAD produces a requirements model, RAD produces a new system Comprehensive methodology Four-phase life cycle that parallels the traditional SDLC Reduces development costs and time Increases the probability of success Based on prototyping and user participation Modified prototypes based on user input

RAD Phases and Activities FIGURE 4-5 The four phases of the RAD model are requirements planning, user design, construction, and transfer. Observe the continuous interaction between the design and construction phases of the user

The requirements planning team agrees on business needs, project scope, constraints, and system requirements. Management’s authorization is obtained to proceed. User design. Users interact with analysts to develop models and prototypes. working model

Scheduling application creation and development Users can suggest changes as screens or reports are developed.

Ppt 11 Ideal And Non Ideal Solutions

Goals of RAD Reduce development time and expense by involving users in all phases of system development Enable the development team to make necessary changes quickly as the design evolves Advantages of RAD Systems developed faster with significant cost savings Disadvantages of RAD Does not focus on strategic business needs (system may work well in the short term but not achieve long term goals) Less time to develop quality, consistency and design standards

16 Agile Methods Agile methods attempt to develop a system incrementally, building a series of prototypes and constantly adjusting them to user requirements. Developers review, extend, and merge previous versions into the final product. It emphasizes continuous feedback and each incremental step is affected by what has been learned in previous steps

17 Agile Methods (cont.) FIGURE 4-6 Agile supports various modeling tools such as Unified Modeling Language, use cases, and business process modeling, among others

Pigs include the Product Owner, the Enabler, and the Development Team. Learners include users, other stakeholders, and managers. Scrum sessions have specific guidelines that emphasize blocks of time, interaction, and team-based activities that result in a software deliverable FIGURE 4-7 In a rugby scrum, team members prepare to launch – each other to achieve their goals.

Student’s Experiences With Online Teaching Following Covid 19 Lockdown: A Mixed Methods Explorative Study

Very flexible and efficient to deal with change. Frequent deliveries constantly validate the project and reduce risk. Team members need a high level of technical and interpersonal skills. May be subject to significant changes in scope.

Involves graphical methods and non-technical language that represent the system at various stages of development Can use various tools Functional Decomposition Diagrams Functional Decomposition Diagram (FDD) Models business functions and shows how they are organized into lower-level processes

Functional Breakdown Diagrams Top-down representation of a function or process Similar to an organizational chart FIGURE 4-8 This Visible Analyst FDD shows a library system with five top-level functions. The Library Operations feature includes two additional levels of processes and subprocesses

Business Process Modeling Business Process Model (BPM) Business Process Modeling Notation (BPMN) Swimming Pool Swimming Lanes FIGURE 4-9 Using the Visual Analyst CASE tool, an analyst can create a process diagram of business The overall diagram is called a pool, and the two separate client areas are called swim lanes

Effective Business Presentations With Powerpoint

Data Flow Diagrams The Data Flow Diagram (DFD) shows how the system stores, processes, and transforms data Other related DFDs describe additional levels of information and detail FIGURE 4-10 This Visible Analyst DFD shows how s Books are added and removed from the library system

Use Case Diagrams User-System Interaction FIGURE 4-12 This table documents the credit card validation use case shown in Figure 4-11 FIGURE 4-11 This use case diagram from Visible Analyst shows a sales system, where the actor is a customer and the use case is a credit card validation

Sequence Diagrams Show the timing of interactions between objects as they occur FIGURE 4-14 This Visible Analyst sequence diagram shows a credit card validation process

Sample Results The website should report online volume statistics every four hours and hourly during peak periods. The inventory system must produce a daily report showing the part number, description, available quantity, allocated quantity, on-hand quantity and unit cost of all ordered. by part number The contact management system must generate a daily reminder list for all sales representatives. The procurement system must provide suppliers with updated specifications

System Development Life Cycle

Input Examples Production employees must enter their ID cards into online data collection terminals that record labor costs and calculate production efficiency. The department head must enter the overtime hours on a separate screen. must include date, time, product code, customer number and quantity. Data entry screens should be uniform except for the background color, which can be changed by the user. A medical group data entry person must enter the patient’s services into the billing system

Process Examples The student registration system must calculate the GPA at the end of each semester. As the final step in year-end processing, the payroll system must update employee wages, bonuses, and benefits and produce tax data required by the IRS. The warehouse distribution system must analyze daily orders and create a route pattern for delivery trucks that maximizes efficiency and reduces unnecessary mileage. it should automatically generate an insurance claim form

Performance examples The system must support 25 simultaneous online users. The response time must not exceed four seconds. The system must be operational seven days a week, 365 days a year. The Accounts Receivable System must issue statements before the third business day of the following month. the registration system must prepare the class lists within five hours of the close of registration. The online inventory control system must mark all items as low within one hour after the quantity falls below a predetermined minimum.

Control examples The system must provide connection security at the operating system level and at the application level. An employee record should only be added, changed or deleted by a member of the HR department. The system must maintain separate levels of security for users and the system administrator. All transactions must have audit trails. The sales manager must approve orders that exceed a customer’s credit limit. The system must create an error log file that includes the error type, description, and time

Seminar Chapter One Ppt

Scalability Ability of a system to handle a larger volume of business and transactions in the future A scalable system provides a better return on the initial investment To assess scalability, you need information about the expected future volume of all outputs, inputs and processes

Total cost of ownership Total cost of ownership (TCO) is especially important if the development team is evaluating several alternatives. One problem is that cost estimates tend to underestimate indirect costs Quick Economic Justification (REJ) FIGURE 4-15 HP urges viewers to accept the TCO challenge. Interested viewers can download a step-by-step TCO analysis created by HP

First, you need to identify the information you need. Develop a fact-finding plan Who, what, where, when, how, and why? The difference between asking what is done

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