MIS 3320 Exam 2 Sanchez
Process Modeling - ANS-the graphical representation of a company's business process
or workflows, as a means of identifying potential improvements
Data Flow Diagramming (DFD) - ANS-a process modeling tool that capture, manipulate,
store, and distribute data between a system and its environment and among system
components
Process - ANS-verb phrase task, step-by-step instructions are followed that transform
inputs into outputs
Data Flow - ANS-data flowing from place to place, such as an input or output to a
process; data in motion
External Agent - ANS-the source or destination of data outside the system
Data Store - ANS-data at rest being stored for later use, usually corresponds to a data
entity on an entity relationship diagram
Source - ANS-external agents that send or receive information
Sink - ANS-could be another company, system within our system
Context Diagram - ANS-an overview, shows the relationship between the external
agents and the system (process 0)
Rules for Context Diagram - ANS-Process 0, is the project name itself
No connector or data stores
Cannot have more external agents later on
* Present top down
Level 0 Diagram - ANS-shows the decomposition of the main system in to its major
process and the data that flows between them
Rules for Level 0 Diagram - ANS-Do not include all data stores (only the ones shared
between the major processes)
Always number process 1.0, 2.0, 3.0
, Level 1 Diagram - ANS-a detailed diagram for each #.0 process
Rules for Level 1 Diagram - ANS-Data flow should use a noun preface by some
adjective
Watch our for inconsistent names
Naming Conventions - ANS-Processes = verb phrase (verb + object)
Data Flows = noun/noun phrase (adj + object)
Data Stores = noun/noun phrase (adj + object)
External Agent = noun/noun phrase (adj + object)
* Be balanced
* Be consistent
* Be readable
DFD Rules - ANS-Process = must have both inputs and outputs; at least one output
must be different
Data flow= has only one direction; cannot return directly to the process
Functional decomposition - ANS-break down the overall function into smaller parts
Abstraction - ANS-
Noun technique - ANS-a technique used to identify things in the problem domain by
finding and identifying the nouns in a dialog or description
"Things" - ANS-defining system requirements by understanding "things" (within the
problem domain) that needs to be stored
Entity Relationship Diagram (ERD) - ANS-a diagram consisting of data entities, their
attributes, and their relationships
- data modeling technique
- used to later build the database
- will become tables later
Entity - ANS-the term used to describe things about which the system needs to store
information; a noun (person, place, object, or event)
Attributes - ANS-descriptive pieces of information about things or objects; information
about an entity that is within the scope
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