Management information systems revision question and answer

CPA-Quantitative-Analysis-Section-4 BLOCK RELEASE

a) With the aid of an appropriate example, explain the following tools for documenting and modelling user requirements
i) Data Flow Diagrams
ii) Structured English statements
iii) Decision tables
iv) Decision trees

Tools
DFDs
Data flow diagrams (DFDs) are graphical aids that describe an information system DFDs represent a logical model that shows what a system does, not how it does it

Four basic symbols
 Process
 Data flow
 Data store
 External entity
Context diagrams/ Diagram 0 Lower-level diagrams- Level 1-3

Structured English
Subset of Standard English
Describes process logic
 Use only standard sequence, selection, and iteration structures
 Use indentation for readability
 Use a limited vocabulary
Decision tables
Show a logical structure that describes process logic
 Every logical combination is shown initially
 Results then can be combined and simplified
 Programmers can use decision tables in developing code
Decision trees
 Graphical representation that shows a decision table‘s conditions, actions, and rules
 Logic structure is shown horizontally
 Easy to construct and understand
 Decision table is better in complex situations

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