Tuesday Nov 08, 2011

OUM is Business Process and Use Case-Driven

Business Process and Use Case-Driven

Business processes and use cases are used as the primary artifacts for establishing the desired behavior of the system and for communicating this behavior among the stakeholders.

OUM projects are able to document requirements through business process models, through use cases, and through written supplemental and quality of service requirements. OUM guidance helps implementers to understand where each technique is appropriate and how they fit togehter

Business processes modeling helps stakeholders and implementers to understand the business processes of an organization, and look at the business requirements that are satisfied by a particular business process. To complement business process models, use cases models and use cases may be used to:

  • Provide a consistent mechanism to link system requirements to design and test tasks
  • Bridge the gap between business modeling, business processes, and software system functionality
  • Provide a consistent thread through OUM – use cases help amplify and consolidate the many other benefits of the method
  • Identify implicit or unstated requirements
  • Manage traceability of requirements through testing

Often business process models for predefined solutions exist and contain some form or description of how the user interacts with the system or how a system interacts with another system. Where these business process models already exist, they should be reviewed as a means of gathering business requirements. The need for additional use case modeling would depend on how well the business process models have captured the requirements of the business. Use cases become particularly important where there is a significant gap between the functionality required by the business and the functionality provided by the predefined solution or software product that is being employed. OUM proposes that implementers develop only the set of models and artifacts required to understand and document requirements and trace those requirements through the implementation lifecycle.

As the project progresses and where the need to develop use cases arises, the use cases are analyzed and the system is designed and implemented to meet the requirements captured in the use cases. The implemented components are tested to verify that they provide the business benefit described by the use cases. All of the models (Use Case Model, Analysis Model, Design Model, Architectural Implementation, and Performance Test Transaction Models) are related to each other through trace dependencies. Use cases are prioritized to:

  • Define the architecture before committing too much resource
  • First deliver the components with the highest value to the customer
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