Transition from Systems Analysis to Systems Designs
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The document discusses the transition from systems analysis to systems design. Systems analysis involves breaking down a system into its components and understanding how they work together. There are different approaches to systems analysis like structured analysis, object-oriented analysis, and joint application development. Systems design defines the architecture, modules, interfaces, and data flow of a system to meet specific business needs. It is important in design to consider the system, environment, goals, feedback, and resources from a holistic perspective. The transition requires an accurate requirements document to inform the logical and physical design phases.
![Systems Analysis
Structured Analysis
•“Structured analysis is a set of techniques and graphical tools
that allow the analyst to develop a new kind of system
specification that are easily understandable to the user. Analysts
work primarily with their wits, pencil and paper.” [Kendall 1996]
•Uses a set of process models to describe a system graphically
•The availability of CASE tools in the 1990s enabled analysts to
develop and modify the graphical SASD models.](https://image.slidesharecdn.com/systems-170401142841/85/Transition-from-Systems-Analysis-to-Systems-Designs-5-320.jpg)
Transition from Systems Analysis to Systems Designs
- 1. Transition from Systems Analysis to Systems Design
- 2. What is Systems Analysis? • is a problem-solving method that involves looking at the wider system, breaking apart the parts and figuring out how it works in order to achieve a particular goal.
- 3. Systems analysis involves looking at inputs, outputs, mechanisms and controls
- 4. Systems Analysis The first step in solving a problem that involves a system is analyzing that system. This involves breaking it down into the parts that make it up, and seeing how those parts work together. Sometimes figuring out how a system works can involve turning off parts of the system and seeing what happens, or changing parts of the system and seeing what the result is.
- 5. Systems Analysis Structured Analysis •“Structured analysis is a set of techniques and graphical tools that allow the analyst to develop a new kind of system specification that are easily understandable to the user. Analysts work primarily with their wits, pencil and paper.” [Kendall 1996] •Uses a set of process models to describe a system graphically •The availability of CASE tools in the 1990s enabled analysts to develop and modify the graphical SASD models.
- 6. Systems Analysis • Object-oriented (O-O) analysis – O-O analysis combines data & processes into things called objects – O-O analysis uses object models to represent data and behavior, and to show how objects affect other objects – By describing the objects (data) and methods (processes) needed to support business operation, a system developer can design reusable components that allow faster system implementation and decreased development cost
- 7. Systems Analysis Object-oriented (O-O) analysis • objects combine data and processes. Object are the end product of object-oriented analysis. Object is a member of a class • Class is a collection of similar objects • Objects possess characteristics called properties • Properties inherits from the object class or possesses on its own • In O-O design, built-in processes called methods can change an object’s properties • Object can send information to another object by using a message • A message requests specific behavior or information from another object
- 8. Object-oriented (O-O)Object-oriented (O-O) analysisanalysis The PERSON class includes INSTRUCTOR and STUDENT objects, which have their own properties and inherited properties.
- 9. • Joint Application Development and Rapid Application Development – JAD – The basic idea behind JAD is to bring structure to the requirements determination phase of analysis and to the reviews that occur as a part of design. – Team based fact finding – Users, Managers and Analysts work together for several days – System requirements are reviewed – Structured meetings .
- 10. – RAD – created to radically decrease the time needed to design and implement information systems. – RAD relies on extensive user involvement. • Incorporate special techniques and tools: – CASE tools – JAD sessions – Fourth generation/visualization programming languages – Code generators .
- 11. What is System Designs? • is the process of defining the elements of a system such as the architecture, modules and components, the different interfaces of those components and the data that goes through that system • it is meant to satisfy specific needs and requirements of a business or organization through the engineering of a coherent and well-running system.
- 12. What is the most important thing to be aware of in systems design? A systems approach to design asks: •For this situation, what is the system? •What is the environment? •What goal does the system have in relation to its environment? •What is the feedback loop by which the system corrects its actions?
- 13. What is the most important thing to be aware of in systems design? • How does the system measure whether it has achieved its goal? • Who defines the system, environment, goal, etc.—and monitors it? • What resources does the system have for maintaining the relationship it desires? • Are its resources sufficient to meet its purpose?
- 14. The Transition to Systems Design • Preparing for Systems Design Tasks – It is essential to have an accurate and understandable system requirements document • Logical and Physical Design – The logical design defines the functions and features of the system and the relationships among its components – The physical design of an information system is a plan for the actual implementation of the system