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SSA - Exam 2 questions well answered already passed
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SSA - Exam 2 questions well answeredalready passed
Data Flow Diagrams(DFD) - correct answer ✔✔- graphical representation of data processes and flows
throughout the organization
- emphasizes logic of underlying system
- based on general systems model
*Input ---> Process ---> Output
Why use DFD? - correct answer ✔✔- logical information flow of the system
- determination of physical system construction requirements
- simplicity of notation
- establishment of manual and automated systems requirements
Advantages of DFD - correct answer ✔✔- early understanding of system technical implications
- establishment of inter-relatedness between business and systems
- determine if data and processes have been defined properly
- user involvement with system development
DFD - Four Symbols - correct answer ✔✔Process: oval/rounded square
Data store: skinny rectangle
Source/sink: normal rectangle
Data flow: arrow
Process - correct answer ✔✔work/actions performed on data so that they are transformed, stored, or
distributed
Data Store - correct answer ✔✔data at rest, notebook, file folder, database
, Source/Sink - correct answer ✔✔origin and/or destination of the data ("external entity" or just "Entity")
(NOT THE SAME AS ERD ENTITY)
Data Flow - correct answer ✔✔data in motion
DFD Formatting Symbols - correct answer ✔✔Entity (square)- external to boundaries of system (sources
and destinations of data)
Data Flow (arrow)- data movement (electronic exchange; paper documents)
Process (rounded square)- transformation of data (from input to output)
Data Store (skinny rectangle)- data depository for (electronic files; paper files (sometimes shown as an
upside down triangle)
External Entities - correct answer ✔✔- supply data to the system
- receive data/information from the system
- but not considered part of the system
Entity -Purchase Order-> Enter orders
Data Flows - correct answer ✔✔- represent data being moved to or from (an external entity, a process, a
data source)
- shown as a line with arrowheads
- labeled with description of the type of data, document, or report
Enter orders -Orderdata-> Open order file
Processes - correct answer ✔✔- set of task performed on data to convert inputs to outputs
- labeled as a verb/noun (e.g., ENTER ORDERS)
- data flow out always labeled differently than data flow in
Entity -Purchase order-> Enter orders -Order data-> Open order file
Processes - 4 types - correct answer ✔✔- reorganize input(sort, reformat, filter/select)
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