Can someone please answers these question for my senior System Analysis Class: 1
ID: 3847228 • Letter: C
Question
Can someone please answers these question for my senior System Analysis Class:
1. What is a process model? What is a data flow diagram (DFD)? Are the two related? If so, how?
2. Distinguish between logical process models and physical process models.
3. Define what is meant by a process in a process model. How should a process be named? What information about a process should be stored in the CASE repository?
4. Define what is meant by a data flow in a process model. How should a data flow be named? What information about a data flow should be stored in the CASE repository?
5. Define what is meant by a data store in a process model. How should a data store be named? What information about a data store should be stored in the CASE repository?
6. Define what is meant by an external entity in a process model. How should an external entity be named? What information about an external entity should be stored in the CASE repository?
Explanation / Answer
1.Process models are processes which are of the same kind and they are bundled together into a model.This are basically the definition of a process at a type level.
A data flow diagram (DFD) is a graphical representation of the flowing of the data in the whole process.Its the basic step to create a basic schema of the system.The bubbles are the process which are used in the diagram,the arrows points the direction in which the process is flowing.
Yes,both process model and data flow diagram is related.The process model is a main concept in structured analysis and design.It is also known as DFD.In every process it transforms the input into output and also the arrow in the process shows the direction of the flow.
2.The difference between logical process model and physical process model are as follows
a.Logical process is about gathering information about the model whereas physical model are mainly used for the designing.
b.Logical process does not show any constraints or indexes whereas physical model shows constraints about the software and hardware resources.
c.Logical process model includes; ERD, business process diagrams whereas physical process model includes server model diagram and user feedback documentation.
3.Process is an block which performs a specific task in the business model.It can be both manual or computerized.The naming should be done by starting with a verb and ending with a noun.The names should be short and precise but it can be easily understandable. In case of repository process it should have a label (name), type (process), description (what is it), process number, process description, notes.This are needed.
4.Data flow can be termed as a small fragment of data within the whole bunch of data. The naming should be done using a noun.In case of repository the data should have a name and a description.