null
US
Iniciar Sesión
Regístrate Gratis
Registro
Hemos detectado que no tienes habilitado Javascript en tu navegador. La naturaleza dinámica de nuestro sitio requiere que Javascript esté habilitado para un funcionamiento adecuado. Por favor lee nuestros
términos y condiciones
para más información.
Siguiente
Copiar y Editar
¡Debes iniciar sesión para completar esta acción!
Regístrate gratis
84699
DFD Basics
Descripción
(Data Flow Diagrams) Systems Analysis & Design Mapa Mental sobre DFD Basics, creado por callumh93 el 12/05/2013.
Sin etiquetas
data flow diagrams
systems analysis & design
systems analysis & design
data flow diagrams
Mapa Mental por
callumh93
, actualizado hace más de 1 año
Más
Menos
Creado por
callumh93
hace más de 11 años
70
0
0
Resumen del Recurso
DFD Basics
Graphical representation of the flow of data throughout a system
shows what kinds of information will be input to and output from the system
Also shows where data will come from and go to, and where the data will be stored
does not show information about the timing, or about whether processes will operate in sequence or in parallel
common practice to draw the context-level data flow diagram first
shows the interaction between the system and external agents which act as data sources
context diagram shows the entire system as a single process, and gives no clues as to its internal organization
Context Level DFD
no inside workings of the process are detailed
Level 1 DFD that shows some of the detail of the system being modeled
shows how the system is divided into sub-systems (processes)
Every process detailed on the level 0 diagram has a level 1 diagram
Must be balanced - i.e. show same input/output flows & data stores as detailed in level 0 DFD
Data flow diagrams can be used in both Analysis and Design phase of SDLC.
Gane and Sarson Elements
Process - has a number, name, description, at least one output flow, at least one input flow
Data flow arrow - has a name, one or more connections to a process
Data store - has a number, name, description, 1 or more output flows, 1 or more input flows
External entity - has a name and description
Level 0 DFD
Shows all processes, data stores,external entities, and data flows amongst them
Purpose is to show major high level processes that are interrelated
Overview of the system
Level 2 DFD
Shows a level 1 DFD in more detail
Again has to be balanced by showing the same input/output flows & data stores as the level 1 equivalent
Numbering at this level has two decimal points e.g. 1.2.4
Mostrar resumen completo
Ocultar resumen completo
¿Quieres crear tus propios
Mapas Mentales
gratis
con GoConqr?
Más información
.
Similar
Game and Sarson Symbols
callumh93
Data Flow Diagrams
Lilli Flahh
Data Normalisation Basics
callumh93
How to normalise logical data models
callumh93
Relational Algebra
callumh93
Data Flow Diagrams
P McIvor
Tabla Periódica de los Elementos
maya velasquez
Modelo de Examen de Inglés - Selectividad
juanmadj
Símbolos y Abreviaciones para tomar apuntes
Diego Santos
Mapa mental: Sinónimos y Antónimos
mariela.bolanos
MÚSCULOS DE MIEMBRO INFERIOR
sarai palque santos
Explorar la Librería