Exam (elaborations)
Systems Analysis and Design - Chapter 5 questions and answers 2023
- Module
- SYSTEM ANALYSIS AND DESIGN
- Institution
- Oxford University (OX)
Systems Analysis and Design - Chapter 5 questions and answers 2023
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Systems Analysis and Design - Chapter5 questions and answers 2023
a graphical way of representing how a business system should operate. It illustrates the
processes or activities that are performed and how data move among them. Process model is a
DFD. Contains two data components: the data flow (composed of data elements) & the data
store. The purposes of these are to illustrate - answer process model
is a technique that diagrams the business processes and the data that pass among them.
The DFD's focus is mostly on the processes or activities that are performed - answer what is
data flow diagramming? (DFD)
models that describe a process, without suggesting how they are conducted - answer logical
process models
physical process models provide information that is needed to build the system - answer
physical process model
a process is an activity or a function performed for some specific business reason. Every process
must have a at least one input data flow and one output data flow. - answer process
a data flow is a single piece of data, or a logical collection of several pieces of information. -
answer data flow
is a collection of data that is stored in some way. Form the starting point for the data model and
are the principal link btw the process model and the data model. - answer data store
is a person, organization, org unit, or system that is external to the system but still interacts with
it. (ex: customer, gov org, accounting system) Key point is that it is external to the system, but
may or may not be part of the organization. - answer external entity
, breaking down DFDs to individual DFDs for further detail - answer Decomposition
it shows the entire system as one process. Defines how the business process or computer
system interacts with its environment. - answer Context Diagram
shows all the major high level processes of the system and how they are interrelated. A process
model has one and only one level 0 DFD - answer Level 0 Diagram
ensuring that all information presented in a DFD at one level is accurately represented in the
next-level DFD - answer Balancing
Each process of level 0 is decomposed into more explicit DFD called LEvel 1 - answer Level 1
Diagrams
as many processes as you have in level 0 - answer How many level 1 diagrams should there be?
the next level of decomposition- shows all the processes, data flows, and data stores that
comprise a single process on the level 1 Diagram. - answer Level 2 Diagrams
when a process produce data that flows under a different circumstance - answer Alternative
Data Flows
used to explain why alternative data flows are different - answer Process discription
- structured english
- decision trees
- decision tables - answer What are the 3 techniques used to describe processing logic
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