Sometimes it is possible to resolve the conflict by analyzing the conditions under which the requirement takes place. In this case the conflict cannot be resolved by adding conditions, so one of the requirements should be changed or removed.
Indirect conflict occurs when requirements do not describe the same functionality, but it is not possible to fulfill both requirements at the same time:. REQ1 For outbound and inbound flights, the user shall be able to compare flight prices from other, nearby airports. REQ2 The outbound and return flights shall be sorted by the smallest number of stops.
The usage should be consistent. The first requirement related to only the flight date is a subset of the second one related to any date entered by the user. REQ1 A destination country does not need to be displayed for flights within the U.
What about flights to Canada and Mexico? All applicable requirements should be specified. This is the toughest condition to be checked. A good requirement should have more criteria. However, they usually can be expressed as a combination of the criteria we have just discussed:. I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.
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This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Enterprise Architect can assist by allowing each requirement to be traced to an implementation element such as a Use Case or a Component. The Relationship Matrix can be used to quickly identify those requirements that are not traced to a lower level element.
The requirements as a set must be consistent and cohesive and express the behavior of the system; any gaps must be determined and overlap between requirements must be resolved. Following a requirements process will assist greatly, and Enterprise Architect has a number of facilities that will make it easy to keep the requirements cohesive.
Missing requirements can be identified using the Relationship Matrix where, for example, a matrix of stakeholders and their requirements would quickly identify stakeholders who didn't have requirements.
Each requirement must fully describe the necessary functionality or behavior that will result in the stakeholder's need being met. Enterprise Architect can help by team members using the Team Library facility or the Collaborate window. Some analysts prefer to mark requirements as needing to be completed, by appending the Requirement element with a tag such as 'TBC'.
Enterprise Architect can assist by allowing the analyst to search across the requirements Packages for this tag and return a list of elements that require further work. A Model View could also be set up using this search to populate the view.
The Collaborate window is also helpful because the information added is not part of the Requirement itself and does not contaminate the Requirement's notes with text that isn't part of the Requirements definition. A Requirement must be up-to-date and reflect the current knowledge and project status.
Enterprise Architect can assist the analyst by allowing the sources of requirements to be modeled and the requirements themselves can be traced back to these artifacts so when the source is changed all the affected elements could be located. The requirements should be independent of each other, and not have overlapping statements that conflict with each other or restate the same need. A degree of analysis will be required as there will inevitably be some overlap, but this can be kept to a minimum by creating requirements in hierarchies and working systematically.
Enterprise Architect has a number of features that can assist with this, including the Relationship Matrix , which will help to identify overlap. The powerful and flexible search function could also be used to identify overlapping or conflicting statements. This means that a requirement can be changed without there being the need to modify other related requirements. It also applies to a Software System Requirements Specification and requires that it can be changed easily.
Enterprise Architect can assist with both these issues; the Requirements themselves can easily be located through the search facility, and the text and properties changed easily. The System Requirements Specification is automatically generated from the model, so by simply changing one or more requirements and regenerating the document it will be updated. A Requirement is a specification of a characteristic or behavior, and does not exist in isolation but is typically related to up-process entities such as stakeholders, business drivers and goals, and down-process entities such as Use Cases and components.
Enterprise Architect allows elements to be traced in any direction and provides a number of powerful tools to visualize the traces, including the Relationship Matrix , the Traceability Window and the Requirements diagram itself. The Insert Related Elements facility can be used to automatically construct a diagram of traces. This dictates that each requirement be uniquely labeled and expressed separately from other requirements so that you can refer to it unambiguously.
Each requirement should appear only once in the SRS. Consider cross-referencing subsequent instances back to the original statement instead of duplicating the requirement. A table of contents and an index will make the SRS easier to modify. Storing requirements in a database or a commercial requirements management solution makes them into reusable objects. A traceable requirement can be linked backwards to its origin and forward to the design elements and source code that implement it and to the test cases that verify the implementation as correct.
Traceable requirements are uniquely labeled with persistent identifiers. They are written in a structured, fine-grained way as opposed to crafting long narrative paragraphs. Avoid lumping multiple requirements together into a single statement; the individual requirements might trace to different design and code elements.
The best way to tell whether your requirements have these desired attributes is to have several project stakeholders carefully review the SRS. Different stakeholders will spot different kinds of problems. However, if you keep these characteristics in mind while you write and review the requirements, you will produce better requirements documents and you will build better products. Click to download this informative whitepaper and learn how to up-level your risk management practices: Conquering the 5 Biggest Challenges of Requirements.
Click to download this informative whitepaper and learn how to enable testing earlier in the process to reduce risk: Verify, Validate, Trace, and Test. Click to watch this informative webinar and learn how to establish effective review cycles across distributed stakeholders: How to Streamline Reviews and Collaborate with Remote Teams, Customers, and Suppliers. Click to dowload this info-packed ebook to improve collaboration and alignment across key stakeholders: Guide to Optimizing Engineering Team Collaboration.
Dowload this ebook to learn the importance of tracing requirements without the headaches and risks of a traceability matrix in Excel and set your organization up for future success: The Jama Software Guide to Requirements Traceability. In this webinar we address how to solve some of the key challenges teams face when integrating hardware and software requirements, risks, and tests, with a document based or legacy tool approach: Managing Product Development Complexities Across Hardware and Software Teams.
Dowload this whitepaper to learn how to manage projects more effectively and efficiently using collaboration, traceability, test coverage, and change management: Successful Product Delivery. Dowload this eBook to learn the business value of better requirements, the four fundamentals of requirements management, and finding the right level of detail in requirements: Best Practices Guide to Requirements and Requirements Management.
Dowload this eBook to gain insights to help you thoughtfully consider potential requirements and test management solutions. Jama Software has partnered with Karl Wiegers to share licensed content from his books and articles.
Karl Wiegers is an independent consultant and not an employee of Jama Software. He can be reached at ProcessImpact.
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