Data Flow Diagram

approach of structure Scheme started from early 1970. Structure approach provided with [by] the appliance ( tools) and technic – technic ( techniques) required in system development, so that end result from system developed will be obtained system which its structure is defined better and clear. [Through/ passing] structure approach, problems which komplek in solvable organization and result of from easy system to be looked after, flexible, more gratifying of its wearer, having good documentation, timely, as according to budget development, can improve the productivity and its quality will be better ( mistake).

Data of Flow Diagram ( DFD) [is] model making appliance conducive [of] system professional to depict the system as a(n) connective [by] functional process network one [is] of equal other;dissimilar with the data path, either through manual and also computerize. DFD this [is] often referred [as] also by the name of Bubble chart, Bubble Diagram, model the process, diagram groove the job, or model the function. This DFD [is] one of appliance of model making which [is] often used, specially if/when system function represent the more shares important and [is] complex the than [at] data which manipulation by system. Equally, DFD [is] appliance of model making giving emphasis only at system function. This DFD represent the appliance of system scheme orienting [at] data path with the concept dekomposisi applicable to depiction analyse and also easy system device communicated by system professional to and also wearer maker of program. approach of structure scheme started from early 1970. Structure approach provided with [by] the appliance ( tools) and teknikteknik ( techniques) required in system development, so that end result from system developed will be obtained system which its structure [is] defined better and clear. [Through/ passing] structure approach, problems which complex [in] solvable organization and result of from easy system akam to be looked after, flexible, more gratifying [of] its wearer, having good documentation, timely, as according to budget development, can improve the productivity and its quality will be better ( mistake).

Data flow diagram component

According to Yourdan and DeMarco

Terminator process Data store Data grove

Contex diagram

Consist of one process and depict the scope from an system representing highest level from DFD depicting entire/all input to system and output from system limited by boundary ( depicted by dash line) There may not be any depository ( storage).

Context diagrams are typically drawn using:

• labeled boxes to represent each of the external entities and
• another labeled box to represent the system being developed.
• Relationship are drawn as a line between the entities and the system being developed.
• Relationships are labeled with a subject-verb-object format.

Proses specification

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

Data flow

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 stream of 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 system.

Name

a) name of data Stream consisted of some word stream attributed to by a continued line.

b) There may not be any data stream which its name [is] of equal and name gift have to mirror the its contents.

c) Data stream consisted of some element can be expressed by grup [is] element.

d) Avoid the word use ‘ data’ and ‘ information’ to give the name [of] [at] data stream.

e) As possible name of data stream writed complete.

Other provisions

a) name of data flow which come into an process may not [is] equal to secretory data stream name from the process.

b) name of data flow which come into an process may not [is] equal to secretory data stream name from the process.

· Sysple data flow and easy to comprehended

· Data flow draw all data item

c) 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/link] with the data storage have to [through/ passing] process.

Process

Process to represent what done by system process earn the of data or incoming data stream become the data stream go out the Process function the mentransformasikan 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 often [is] also referred [as] [by] bubble.

Pedoman pemberian nama proses

· 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[n bubble.

There may not be any some process owning same name.

· Process have to be given [by] the number. Number sequence as possible follow the stream or sequence process, but that way meaningless number sequence absolutely represent the sequence process chronologically

Data storage

data Storage represent the existing data repository in system Symbol with the couple [of] parallel line or two line wrongly one side from other side opened Process can take the data from or give the data to database

.

Guidelines of the name

Ø Name have to mirror the data storage.

Ø When its name more than one word hence have to be said the word to [by] joint.

Data dictionary

Function to assist the system perpetrator to interpret the application in detail and organizational all data element used by a system precisely so that wearer and system analyst have the same congeniality base about input, output, depository and process at phase analyse the, data dictionary used as by unication means of among/between system analyst with the wearer at phase of system scheme, data dictionary used to design the input, report and database Data current of DAD have the character of global, boldness more detailed visible data dictionary

Kamus data memuat hal-hal sebagai berikut :

I. Name of data flow: have to be noted by reader to needing furthermore clarification about an data flow can look for it easily.

II. Alias: alias or name is differ from data can be writedby if there are any.

III. Data form: used to group the data dictionary into its use time of system scheme

IV. Data flow showing where from data emit a stream of and where data go

V. Clarification: giving clarification of about meaning from data current.

Restrictions in dfd

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