Difference between revisions of "Stakeholder Needs and Requirements"
(→Purpose and definition)
|Line 7:||Line 7:|
====Purpose and definition====
====Purpose and definition====
The purpose of Stakeholder Requirements is to a of related to a or the of the ; and to needs into clear, concise, and verifiable stakeholder requirements.
The purpose of Stakeholder Requirements
is , of the needs the of , and () () .
==Principles and concepts==
==Principles and concepts==
Revision as of 21:24, 10 February 2012
- 1 Introduction
- 2 Purpose and definition
- 3 Principles and concepts
- 4 Process Approach
- 5 Practical Considerations
- 6 Works Cited
- 7 Primary References
- 8 Additional References and Readings
It is assumed that the definition of the problem or the issue to be solved and/or the opportunity for developing a new solution or improving a System of Interest has been done when starting the activities for defining the Stakeholder Needs and Requirements. This means that the context of use of the new or modified mission, operation, or capability has been characterized (see Mission Analysis topic).
The Stakeholder Requirements represent the view of the users, acquirers, and customers of the problem or of the opportunity, through a set of requirements for a solution that can provide the services needed by the acquirer, users, and other stakeholders in a defined environment. This topic provides knowledge about the notion of stakeholder needs and requirements, and the activities for identifying and prioritized the needs and transforming those needs into stakeholder requirements.. The definition of the set of Stakeholder Requirements is the primary outcome.
Purpose and definition
The purpose of Stakeholder Needs and Requirements is to elicit a set of needs related to a new or changed mission/operation for the enterprise (see mission analysis for information of identifying and defining the mission/operation); and to transform the needs into clear, concise, and verifiable stakeholder requirements.
Stakeholder Needs Analysis is the elicitation, communication, validation, and refinement of the needs and objectives of the enterprise or set of stakeholders (typically including customer, users, and interacting organizations within an enterprise) aimed at understanding a potential capability (often identified through Mission Analysis) that is needed to address an identified problem or opportunity. After defining the needs, Stakeholder Needs and Requirements interact with the Mission Analysis to transform the defined set of needs into Stakeholder Requirements (aka, Mission Requirements) that reflect the needs.
Principles and concepts
From capture of needs to Stakeholder Requirements definition
Several steps are necessary to state the maturity of the needs, from "real needs" to reaching a realized solution (that could be called "realized needs"). Figure 1 presents the “Cycle of needs” as it can be deduced from Professor Shoji Shiba and Professor Noriaki Kano's works and courses, and is adapted here for systems engineering purposes.
Figure 1 shows these steps and the position of the Stakeholder Requirements and System Requirements in the engineering cycle:
- Real needs are those that lie behind any perception, and indeed may not be perceived at all; they are conditioned by the context in which people live. As an example, a generic need could be “identify infectious diseases easily”. It often looks like a simple action.
- Perceived needs are based on a person’s awareness (possibly imperfect) that something is wrong, that there is a lack of something, that there is something that could improve a situation, or that there are business / investment / market opportunities. Perceived needs are often presented as a list of more or less organized expectations, often resulting from an analysis of the usage conditions for the considered action (see Mission Analysis and Marketing Analysis topic). Following on from the example above, the real need might be perceived as a need to "carry out medical tests in particular circumstances (laboratories, point of care, hospital, human dispensary)". Since the real need is seldom expressed, the richness of the knowledge of the perceived needs is used as a basis for potential solutions. This step has to be as complete as possible to cover all the contexts of use.
- Expressed needs originate from perceived needs in the form of generic actions or constraints, and are typically prioritized. For example, if safety is the top concern, the expressed need “Protect the operator against contamination” may take priority over other expressed needs, such as “Assist in the execution of tests.” Here the analysis of the expected mission or services in terms of Operational Scenarios takes place.
- Retained needs are selected from a more or less important number of expressed needs. The selection uses the prioritization of expressed needs in order to achieve something or make solutions feasible. The retained needs allow the consideration of potential solutions for a System-of-Interest. The retained needs are generally called "Stakeholder Requirements,” and exploration of potential solutions must start from this step. The various solutions suggested at this step are not yet products but describe means of satisfying the Stakeholder Requirements. Each potential solution imposes constraints on the future System of Interest.
- Specified needs, generally called “ System Requirements”, are the translation of the Stakeholder Requirements to represent the view and expression of the supplier of the problem or opportunity, having in mind potential feasible solutions. The expression of System Requirements means that potential solutions as systems exist or can be developed, manufactured, or bought.
- Realized needs are the Product, Service or Enterprise realized, taking into account every System Requirement (and hence Stakeholder Requirement).
Stakeholders and their requirements
Needs, expectations, objectives are collected through stakeholders' interviews (including user surveys), technical documents, feedback from the Verification Process and the Validation Process, and from outcomes of the System Analysis Process. (ISO/IEC. 2008)
Stakeholder Requirements are developed from these needs. To get a complete set of Stakeholder Requirements, it is necessary to consider the System of Interest or the parent system in various stages across its typical life cycle. Every system has its own stages of life; these may include transfer for use or deployment, normal use in operation, production, maintenance, and disposal. For each stage, a list of all actors having an interest in the future system is identified. Those actors are called Stakeholders. The aim is to get every stakeholder point of view for every stage of the system life in order to establish the list of Stakeholder Requirements as exhaustively as possible.
Examples of Stakeholders are provided in Table 1.
Classification of Stakeholder Requirements
Several classifications of Stakeholder Requirements are possible, e.g. ISO/IEC 29148, section 22.214.171.124 (ISO/IEC. 2011) provides interesting elements for classification. These classifications of Stakeholder Requirements have the goal to facilitate the classification of System Requirements and, subsequently, to prepare the design and validation activities. One possible way to classify the Stakeholder Requirements is under the following categories as indicated in Table 2.
The purpose of the Stakeholder Requirements Definition Process is to identify all needs and expectations from every stakeholder (acquirer, users and others) and to define clear, concise, and verifiable Stakeholder Requirements.
Generic inputs are concept of operation and/or mission definition, market studies, preliminary stakeholder needs and expectations, business models, etc.
Generic output is a set of consistent Stakeholder Requirements.
Activities of the Process
Major activities and tasks performed during this process include:
- Elicit, capture or consolidate the stakeholders' needs, expectations, objectives or requirements coming from Mission and Marketing Analysis of the System of Interest.
- And/or consolidate the stakeholder requirements applicable to the concerned system or System Element coming from the physical architecture of the parent system.
- Analyze the acquirers’ and users' needs and define corresponding Stakeholder Requirements.
- Explore, analyze, and identify needs and expectations of the other stakeholders (the list of the stakeholders depends on the system life cycle), including various life cycle constraints.
- Verify quality, completeness of each Stakeholder Requirement and consistency of the set of Stakeholder Requirements.
- Validate content and relevance of each Stakeholder Requirement with corresponding stakeholder representative providing rationale of the existence of the requirement.
- Identify potential Risks (or threats and hazards) that could be generated by the Stakeholder Requirements.
- Synthesize, record and manage the Stakeholder Requirements and potential associated Risks.
Artifacts and Ontology Elements
This process may create several artifacts such as:
- Stakeholder Requirements Document
- Stakeholder Interview Report
- Stakeholder Requirements Database
- Stakeholder Requirements Justification Document (for traceability purpose)
This process handles the ontology elements of Table 3.
Methods and Modeling Techniques
It is recommended to consider several techniques or methods for identifying needs, expectations, and requirements during the elicitation activity to better accommodate the diverse set of requirements sources, including:
- Structured workshops with brainstorming
- Interviews and questionnaires
- Technical documentation review
- Simulations, prototyping, and modeling
- Organizational analysis techniques (e.g., Strengths, Weaknesses, Opportunities, Threats - SWOT analysis, product portfolio)
- Quality Function Deployment (QFD), which can be used during the needs analysis. QFD is a technique for deploying the "Voice of the Customer.” It provides a fast way to translate customer needs into requirements.
- Use Case Diagram of SysML (OMG. 2010)
- Activity Diagram of SysML (OMG. 2010)
- Functional Flow Block Diagram, etc.
Major pitfalls encountered with Stakeholder Requirements are presented in Table 4.
Proven practices with Stakeholder Requirements are presented in Table 5.