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14 Cards in this Set

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Design
process of describing, organizing, and structuring the components of a sytem at both the architectural level and at a detailed level
- converts functional models from analysis into models that represent the solution
- technical issue-focesed
- requires less user invovlement than analysis
Automation system boundary
- partitions data flow processes into manual and automated systems
- processes and data flows can be inside or outside boundary
System Flowchart
representation of various computer programs, files, databases, and associated manual processes

graphically describes organization of subsystems

can show type of system (batch, realtime)
batch processing
a method of collecting and processing data in which transactions are accumulated and stored until a specified time when it is convenient or necessary to process them as a group
Structure Chart
describes functions and subfunctions of each part of system

shows relationships between modules of a computer program

simple and direct method
- each module performs a specific function
- each layer in a program performs specific activities
Module
a logical unit of a program that performs one or several functions
structure chart basics
-there is a single coordinating module at the root
-modules below the root are called by the coordinating module
-each module is represented as a rectangle containing a descriptive name of its function
Transaction analysis
- system flow chart and event table inputs
- upper-level modules developed first
- identifies each transaction supported by program
Transform analysis
- computer program transforms inputs into outputs
- structure charts have input, caluculate, and output subtrees
- uses DFD fragments for inputs
Steps to Create a Structure Chart from a DFD fragment
- determine primary information flow
- find process that represents most fundamental change from input to output
- redraw DFD with inputs to the left and outputs to the right
- generate first draft of structure chart
- add other models (input, data storage, output0
- add logic from structured english or decision tables
- make final refinements
Module coupling
measure of how module is connected to other modules in program
Module cohesion
measure of internal strength of module

module performs one defined task
what kind of modules are desirable? (in regards to cohesion and coupling)
highly cohesie and loosely coupled modules are desirable
Module Algorithm Design: pseudocode
- describes internal logic of software modules
- variation of structure Enlish that is closer to programming clode
- syntax should mirror development language