Page 51 - DCAP405_SOFTWARE_ENGINEERING

Software Engineering

Notes Construction: The construction phase builds increments of the system. Each increment is
developed using a waterfall approach. This includes detailed analysis and design for the
use cases in the increment and coding and testing of the event processors that implement
the sequence of events defined by the use cases. The result is production quality software
that satisfies a subset of the requirements and is delivered to the end users. Work on
different increments may be done in parallel.

Transition: The transition phase is the last phase in the project. This may include such
things a performance tuning and rollout to all users.

Advantages

Generates working software quickly and early during the software life cycle.
More flexible – less costly to change scope and requirements.

Easier to test and debug during a smaller iteration.
Easier to manage risk because risky pieces are identified and handled during its iteration.
Each iteration is an easily managed milestone.

Disadvantages

Each phase of an iteration is rigid and do not overlap each other.
Problems may arise pertaining to system architecture because not all requirements are
gathered up front for the entire software life cycle.

Task Analyze the role of transition phase in incremental model.
3.2.2 RAD Model

RAD is a linear sequential software development process model that emphasis an extremely
short development cycle using a component based construction approach. If the requirements
are well understood and defines, and the project scope is constraint, the RAD process enables a
development team to create a fully functional system with in very short time period.
RAD (rapid application development) is a concept that products can be developed faster and of
higher quality through:
Gathering requirements using workshops or focus groups

Prototyping and early, reiterative user testing of designs
The re-use of software components
A rigidly paced schedule that defers design improvements to the next product version
Less formality in reviews and other team communication

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