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Introduces some basic concepts of requirements engineering
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Stakeholders, viewpoints and concerns, 2013 Slide 1
Stakeholders, viewpoints and concerns
Ian Sommerville
http://www.youtube.com/watch?v=P5X-ridjaOY
Stakeholders, viewpoints and concerns, 2013 Slide 2
Stakeholders
• Sources of requirements
Stakeholders, viewpoints and concerns, 2013 Slide 3
Stakeholders
• People or roles who are affected, in some way, by a system and so who can contribute requirements or knowledge to help you understand the requirements
Stakeholders, viewpoints and concerns, 2013 Slide 4
Medical information system
Stakeholders, viewpoints and concerns, 2013 Slide 5
Medical system stakeholders
• Doctors
• Nurses
• Patients
Stakeholders, viewpoints and concerns, 2013 Slide 6
Medical system stakeholders
• Hospital managers
• Administrators
• Owners of other connected systems
Stakeholders, viewpoints and concerns, 2013 Slide 7
Stakeholders, viewpoints and concerns, 2013 Slide 8
Stakeholder groups• Clinical stakeholders
– Doctors
– Nurses
– Other healthcase professionals
• Management stakeholders– Hospital managers
– Administrators
Stakeholders, viewpoints and concerns, 2013 Slide 9
Viewpoints
• Viewpoints are a way of organising and grouping requirements that have been elicited from stakeholders
Stakeholders, viewpoints and concerns, 2013 Slide 10
Examples of viewpoints
• End-user viewpoint
• Managerial viewpoint
• System administration viewpoint
• Engineering viewpoint
Stakeholders, viewpoints and concerns, 2013 Slide 11
Engineering viewpoint
• Engineers who are developing the system create requirements depending on the techniques and technology used to develop the system
Stakeholders, viewpoints and concerns, 2013 Slide 12
Stakeholders and viewpoints
Stakeholders
requirements
VP1VP2
VP4VP3
Provide information about
Requirements are grouped into viewpoints
Stakeholders, viewpoints and concerns, 2013 Slide 13
Concerns• Concerns are issues that an
organisation must pay attention to and that are systemic i.e. they apply to the system as a whole
• Not concerned with individual functions, features of a system or individual stakeholder requirements
Stakeholders, viewpoints and concerns, 2013 Slide 14
• Concerns are cross-cutting issues that may affect all system stakeholders and the requirements from these stakeholders
Stakeholders, viewpoints and concerns, 2013 Slide 15
Concerns
Software and hardware
Operators and managers
Society
The organisation
SafetyAvailabilitySecurity
Stakeholders, viewpoints and concerns, 2013 Slide 16
The socio-technical triangle
Stakeholders are at different levels in the triangle
Software and hardware
Operators and managers
Society
The organisation
Stakeholders, viewpoints and concerns, 2013 Slide 17
• Concerns help bridge the gap between organisational goals (what the organisation has to achieve) and system requirements (how a system contributes to these goals)
Stakeholders, viewpoints and concerns, 2013 Slide 18
Summary• Stakeholders
– People who have an ‘interest’ or a ‘stake’ in the system
• Viewpoints– Groups of related requirements from
stakeholders
• Concerns– Cross-cutting systemic organizational issues
that generate requirements