User Interface Design Chapter 4 User requirements: elicitation and analysis.

User Interface DesignUser Interface Design

Chapter 4 Chapter 4

User requirements:elicitation and analysis

Learning outcomesLearning outcomes

Outcome 1 : Understand the advantages and

limitations that different systems development

models bring to the requirements elicitation

process.

Outcome 2 :Understand a general model of the

requirements elicitation process and how this

leads to the production of a problem definition.

Learning outcomesLearning outcomes

Outcome 3 : Be ware of the different techniques

used for data collection and understand how to

apply some of more common ones.

Section 1 Section 1

Where do we start?

models

Waterfall model of systems lifecycle

Figure 4.1

Section 1 Section 1

Where do we start?

Star model of systems development

Figure 4.2

Section 1 Section 1

Where do we start?

iterative

evaluation

human centred and iterative development

model

Section 1 Section 1

Where do we start?

Framework of ISO 13470:Human-centred

design processes for interactive systems

Figure 4.3

Section 1 Section 1

Where do we start?

stakeholder

Section 2 Section 2

The problem definition

What you are aiming to achieve and the

next section as how you could achieve

this aim

Summary of main stakeholders

Primary users Main task goals

Other stakeholders Main task goals

Section 2 Section 2

The problem definition

User group characteristics (1/4)

System: Local Office intranet User group: Staff of Local Office

Characteristics

Skills and knowledge

Experience in:

(a)Using the current system

(b)Using other systems with similar main functions

(c)Using systems with the same interface style

Potential system requirements

Education / qualifications

Section 2 Section 2

The problem definition

User group characteristics (2/4)

System: Local Office intranet User group: Staff of Local Office

Linguistic ability

Background knowledge/ IT knowledge

Physical attributesAge range

Physical abilities, limitations/ disabilities

Mental attributesIntellectual abilities(a)Differing information search / browsing preferences(b)Specific mental impairments

Section 2 Section 2

The problem definition

User group characteristics (3/4)

System: Local Office intranet User group: Staff of Local Office

Motivations

(a)Attitude to job and task

(b)Interactions with others

(c)Attitude to the system

(d)Attitude to information technology

(e)Employees attitude to the employing organization

Section 2 Section 2

The problem definition

User group characteristics (4/4)

System: Local Office intranet User group: Staff of Local Office

Job characteristics

Job function

Hours of work / operation

(a)Hours of work

(b)Hours using system

(c)Discretion to use

Other relevant features

Section 2 Section 2

The problem definition

Other user interface requirements

◦Overall concept of the system

◦Usability features

1. Relevance

2. Content

3. Subjective appeal

4. navigation

5. Accessibility

6. Consistency

7. Transparency

Section 2 Section 2

The problem definition

Other user interface requirements

◦specific

◦measurable

◦evaluated

Section 3 Section 3

Techniques for requirements elicitation

Requirements elicitation techniques

Focus on identifying the stakeholders’

needs

Involve all the stakeholder groups

Involve more than one person from each

stakeholder group

Section 3 Section 3

Techniques for requirements elicitation

Use a variety of data gathering techniques

Support the data gathering sessions with

suitable props

Run pilot sessions

Data recording is important

Be realistic about what can be achieved

with the resources available

Section 3 Section 3

Techniques for requirements elicitation

Survey

◦Quantitative

◦Open

◦Categorical

◦Rank order

◦Scalar

Section 3 Section 3

Techniques for requirements elicitation

Focus groups

Interviews

Observation

a final note

◦Data collection

◦Analysis and interpretation