1. Chapter 13 Systems Design & Development

13. Translation Software Translation software, called an interpreter , translates a high-level program to a machine language one statement at a time during execution.

14. Compiler A compiler translates an entire high-level program to machine language before executing the program.

16. Programming Languages & Methodologies An assembler translates each statement of assembly language into the corresponding machine-language statement.

18. Structured Programming Structured programming is a technique to make the programming process easier and more productive. A program is well structured if: - It’s made up of logically cohesive modules - The modules are arranged in a hierarchy - It’s straightforward and readable.

30. The Systems Development Life Cycle The graphical “waterfall” model of the SDLC shows a basic sequential flow from identifying the “right things to do” to making sure that “things are done right.” Investigation Analysis Design Development Implementation Maintenance Retirement

33. The Systems Development Life Cycle Prototyping is an interactive methodology in which the prototype is continually modified and improved until it meets the needs of the end-user. Design Identify requirements Develop working model of system Use Prototype Evaluate features of prototype Develop application, install prototype for evaluation by end users, begin new prototype, or abandon application. Additional changes to prototype needed.

34. The Systems Development Life Cycle The systems analyst must plan and schedule carefully activities in the development phase of the SDLC because they can overlap and occur simultaneously. Development Testing Documenting Scheduling Programming Purchasing

36. The Systems Development Life Cycle Maintenance The maintenance phase involves monitoring, evaluating, repairing, and enhancing the system throughout the lifetime of the system.

37. The Systems Development Life Cycle Retirement Systems are often used for many years, but at some point in the life of a system, ongoing maintenance is not enough. .