is a one phase of systems development life cycle

is a traditional pre-specified approach

is a set of integrated techniques which support the development of an information system at every stage

is an output from one technique

To validate some assertions about reality

To communicate an aspect of a problem to another party

to complicate the user requirements

To simplify reality

is a valid statement

is a set of ordered statements that lead to a conclusion

is an association between a pair of variables

is a claim

Systems development life cycle

Software detect life cycle

Systems development line cycle 

Soft development life centre

Medial

Arriba (superior)

Lateral 

Abajo (inferior)