DFD Quiz

DATA OF FLOW DIAGRAM

Data of Flow Diagram

Referred as also Data of Flow Diagram ( DFD). Depicting system division into smaller module. Facilitating wearer which less comprehend the computer area to understand the system to be done.

Diagram of Context

Consist of by one process and depict the scope from a system. Representing highest level from DFD depicting all input to system and outpur from system. System limited by boundary ( depicted by dash line). There may not be any depository

Diagram of Zero

Depicting process from DFD. Opening on to by totally hit the system handled, showing existing especial process or function, stream of data and eskternal entity. This level is enabled by the existence of data storage. For the process of which is not detailed again at level hereinafter is hence enhanced by a symbol ‘*’ or ‘ P’ by end of number the process. Balance of Input and output balancing of between diagram 0 with the context diagram have to be looked after

Diagram of Detailed

Representing diagram elaborating process of what there is in diagram of zero or level of its above

Level of at DFD

Name Level	Name Diagram	Number Process
0	Context
1	Diagram 0	1.0, 2.0, 3.0, ...
2	Diagram 1.0	1.1, 1.2, 1.3, ...
3	Diagram 1.1	1.1.1, 1.1.2, ...

In one level shall not there are more than 7 fruit process and maximal 9, if when more hence must be done dekomposision

Specification of Process

Each Every process of at DFD have to own the specification of process. At top level method used to depict the process earn by using descriptive sentence. At more level detailed that is at process most under requiring more specification is structure. Specification of process will become the guidance for programmer in making program. Method used in specification of process: breakdown of process in the form of story, decision table, decision tree

External Union

Something that of beyond system, but he give the data into system or give the data from system. Symbol : notation box. External of entity do not the inclusive of the part of system

Naming:

• Terminal Name : noun
• Terminal may not own the same name except its object it is true is of equal

Data Current

Representing place emit a stream of it information. Depicted with the connective straight line of component from system. Data current shown with the direction bow and mark with lines called by for data current emiting a of stream. Data current emit a stream of among process, data storage and show the data current from data which is in the form of input for the of system

Guidance of name gift:

• Name of data Stream consisted of by some word stream attributed to by a continued line
• There may not be any data stream which its name is of equal, name gift have to mirror the its contents
• Data stream consisted of by some element can be expressed by grup is element
• Avoid the word use ‘ data’ and ‘ information’ to give the name of at data stream
• Name of data Stream writed complete.

Rule of is other dissimilar:

• Name of data Stream which come into a process may not is equal to secretory data stream name from the process
• Incoming data Flow, go out from data storage needn't be called by if: simple Data stream, is easy to comprehended, depicting all data item
• There may not be any data stream from terminal to data storage or on the contrary because terminal of non part of system, terminal relation with the data storage have to through process

The Process

Process represent what done by system. Process earn the prosess of data or incoming data stream become the data stream go out. function the transformation one or some input data become one or some output data as according to specification wanted. Each Every process own one or some input and also yield one or some output. Process is often referred as by bubble

Guidance of name Gift process the:

• Name process consisted of by the vb and noun mirroring the process function
• Don't use the word process as part of name of a bubble
• There may not be any some process owning same name
• Process have to be given by number.

Symbol DFD

Data Deposit

Data Storage represent the existing data repository in system. Symbol : a couple of parallel line / two line wrongly one side from other side opened. Process can take the data from or give the data to database. Guidance of name Gift: name have to mirror the data storage, If its name more than one word hence have to be said the word to by joint

Data Dictionary

Function : assisting system perpetrator to interpret the application in detail, organization of all data element used by a system precisely so that wearer & system analyst have the same congeniality base about input, output, depository and process. At phase analyse the, data dictionary used as by communication means of between system analyst with the wearer. At phase of system scheme, data dictionary used to design the input, report and database. Data current of at DAD have the character of global.

The following Data dictionary:

• Name of data Current: have to be noted by reader to needing furthermore clarification about a data current can look for it easily
• Alias: alias or name of is differ from data can be writed by if there are
• Data form: used to group the data dictionary into its use time of system scheme
• Data current: showing where from data emit a stream of and where data go to the
• Clarification: giving clarification of about meaning from data current

Balancing of in DFD

Data Stream which come into and go out from one process have to is equal to data stream which come into and go out from detail of process of at level / level of below its. Name of data Stream which come into and go out from one process have to is equal to incoming data stream name into and go out from detail of the process. Sum up and external name entitas from a process have to is equal to amount and external name entitas from detail of the process.

Things which must be gave attention to by DFD owning more than one level:

• Have to there are balance of input and output of between one next level and level
• Balance of between level 0 and level 1 seen at input / output from data stream to or from terminal of at level 0, while balance of between level 1 and level 2 seen at input / output from data stream to / from pertinent process
• Name of data Stream, data of storage and terminal of at every level have to is of equal if its object is of equal

Interdict of in DFD

• Data Current may not from direct external entitas go to the other external entitas without through a process
• Data current may not from direct data deposit go to the external entitas without through a process
• Data current may not from direct data deposit go to the other data deposit without through a process
• Data current from one direct process go to the other process without through a data deposit better / can is possible avoided