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System Life Cycle - (System) Life Cycle Models

Q: Was ist ein Wasserfall Modell? Welche Vor- & Nachteile hat es?

Vorteile: this model is the oldest & most widely used life cycle model it is well documented and supported it is accepted and well understood by customers the model is a logical sequence of processes and includes: =>Direct mapping to phase specific processes; and =>Clear boundaries of tasks Nachteile: real projects rarely follow a sequential flow of processes it is inflexible to changes in the program scope the customer must have patience because the product is only delivered once, at the end of the process early major problems may be undetected until later stages with disastrous results

Q: Was ist ein Spiral Modell? Nenne die Vor- & Nachteile.

Vorteile: this model has the potential for multiple deliveries the model is focused on reducing risks it allows for an evaluation of risks before proceeding to a subsequent phase each spiral requires customer approval to proceed Nachteile: at its core, a Spiral may still be a Waterfall development the model may encounter some difficulty in overall planning and costing the deliverables may not be well defined each spiral requires customer approval to proceed

Q: ! Was ist ein V-Model? Geben Sie Vor- & Nachteile an.

Vorteile: the model reflects both the top-down and bottom-up approaches with: => Evolution of user requirements into preliminary and detailed designs as shown on the left side; and => Integration and verification of system components through subsystem and system testing Nachteile: one must ensure that feedback is included in the process there should be integration planning during the design requirements phase there should be requirements verification during the integration phase V-model represent an incomplete life cycle (focus at the planning and development process)

4 important questions on System Life Cycle - (System) Life Cycle Models

! Zeichnen Sie den Generic business life cycle.

Generic business life cycle

Was ist ein Wasserfall Modell? Welche Vor- & Nachteile hat es?

Vorteile:

this model is the oldest & most widely used life cycle model
it is well documented and supported
it is accepted and well understood by customers
the model is a logical sequence of processes and includes:
=>Direct mapping to phase specific processes; and
=>Clear boundaries of tasks

Nachteile:

real projects rarely follow a sequential flow of processes
it is inflexible to changes in the program scope
the customer must have patience because the product is only delivered once, at the end of the process
early major problems may be undetected until later stages with disastrous results

Was ist ein Spiral Modell? Nenne die Vor- & Nachteile.

Vorteile:

this model has the potential for multiple deliveries
the model is focused on reducing risks
it allows for an evaluation of risks before proceeding to a subsequent phase
each spiral requires customer approval to proceed

Nachteile:

at its core, a Spiral may still be a Waterfall development
the model may encounter some difficulty in overall planning and costing
the deliverables may not be well defined
each spiral requires customer approval to proceed

! Was ist ein V-Model? Geben Sie Vor- & Nachteile an.

Vorteile:

the model reflects both the top-down and bottom-up approaches with:

=> Evolution of user requirements into preliminary and detailed designs as shown on the left side;

and

=> Integration and verification of system components through subsystem and system testing

Nachteile:

one must ensure that feedback is included in the process
there should be integration planning during the design requirements phase
there should be requirements verification during the integration phase
V-model represent an incomplete life cycle (focus at the planning and development process)