Software Process Model. Software Process. Process consists of activities/steps to be carried out in a particular order Software process deals with both technical and management issues Consists of different types of process Process for software development: produces software as end-result
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Project A: Web-based library applications done by 3 persons in 4 months
another project B (guest house bookings), similar in complexity should also take about 12 person months.
The software engineers has five choices for the selection of software process models. The models are :
In all models , core activities are Analysis, Design , Code, Test are common . However their execution differs from model to model.
Maintenance & support
The following are the phases of LSM:
In this phase ,the requirements for all the elements are worked out.
System engineering denotes the requirements of system level and information engineering denotes the strategic requirements at business level.
In this Phase , the requirements for the software are established through discussion with client and are then documented.
In this phase , the requirements are converted into design to be used in the next phase. The design includes various elements such as database structures, software architecture and procedures.
The design is first passes through the quality test and then documented.
In this phase the actual coding of the software is done. The design of the previous phase is converted into the code.
In this phase, the output generated is checked to ensure that it matches the requirements. The programs developed in the previous phase are checked for the logical and syntax errors.
The software developed needs to maintenance and support. This refers to the changes as well as new requirements in the software after delivery.
The Linear Sequential model offers the following advantages:
The following are the disadvantages using Linear sequential model:
Deliver Final Product
The following are the advantages of Prototyping model:
The prototyping model has the following disadvantages.
The RAD model consist of the following phases.
In this phase, define the flow of information within the organization, so that it covers all the functions. This helps in clearly understand the nature, type ,source and process of information.
In this phase, convert the component of the information flow into a set of data objects. Each object is referred as an Entity.
In this phase, the data objects defined in the previous phase are used to depict the flow of information . In addition adding , deleting, modifying and retrieving the data objects are included in process modeling.
In this phase, the generation of the application and coding take place. Using fourth generation programming languages or 4 GL tools is the preferred choice for the software developers.
In this phase, test the new program components.
The RAD has following advantages:
The RAD model has following disadvantages :
This model has following advantages:
This model consists of a number of activities called task regions.
The number of task regions varies from three to six.
A spiral model consist of the following task regions.
Analysis and planning
Construction through Development Engineering
The spiral model has the following advantages :
The spiral model has the following disadvantages: