The process of interaction design

The process of interaction design

1. interaction design

   • basic activities
     • identifying needs and establishing requirements
     • Developing alternative designs
     • Building interactive versions of the designs
     • Evaluating designs
   • key characteristics
     • focus on users
     • Specific usability and user experience goals
     • Iteration
       • allows designs to be refined based on feedback
   • a plan or scheme conceived in the mind and intended for subsequent execution.
   • involves developing a plan which is informed by the product's intended use, target domain, and relevant practical considerations. Alternative designs need to be generated, captured, and evaluated by users. For the evaluation to be successful, the design must be expressed in a form suitable for users to interact with.

2. practical issues

   • who are the users?
     • those who manage direct users, those who receive products from the system, those who test the system, those who make the purchasing decision, and those who use competitive products
     • Primary users are those likely to be frequent hands-on users of the system
     • secondary users are occasional users or those who use the system through an intermediary
     • tertiary users are those affected by the introduction of the system or who will influence its purchase
   • alternative designs
     • generate
       • alternatives come from looking at other, similar designs, and the process of inspiration and creativity can be enhanced by prompting a designer's own experience and by looking at others' ideas and solutions
     • choose
       • design decisions
         • Will the device use keyboard entry or a touch screen?
         • Will the device provide an automatic memory function or not?

3. Lifecycle models

   • a simple lifecycle model
     • This model incorporates iteration and encourages a user focus
   • in software engineering
     • The waterfall lifecycle model
       • was the first model generally known in software engineering and forms the basis of many lifecycles in use today. This is basically a linear model in which each step must be completed before the next step can be started
     • The spiral lifecycle model
       • incorporates risk analysis and prototyping in an iterative framework that allows ideas and progress to be repeatedly checked and evaluated.
     • Rapid Applications Development (RAD)
       • attempts to take a user-centered view and to minimize the risk caused by requirements changing during the course of the project.
         • key features of a RAD
           • Time-limited cycles of approximately six months, at the end of which a system or partial system must be delivered. This is called time-boxing. In effect, this breaks down a large project into many smaller projects that can deliver products incrementally, and enhances flexibility in terms of the development techniques used and the maintainability of the final system.
           • JAD (Joint Application Development) workshops in which users and developers come together to thrash out the requirements of the system (Wood and Silver, 1995). These are intensive requirements-gathering sessions in which difficult issues are faced and decisions are made. Representatives from each identified stakeholder group should be involved in each workshop so that all the relevant views can be heard.
   • in HCI
     • human-computer interaction
     • The Star Lifecycle Model
       • was derived from empirical work on understanding how designers tackled HCI design problems.
     • The Usability Engineering Lifecycle
       • shows a more structured approach and hails from the usability engineering tradition.
   • the term is used to represent a model that captures a set of activities and how they are related
   • they allow developers, and particularly managers, to get an overall view of the development effort so that progress can be tracked, deliverables specified, resources allocated, targets set, and SO on

4. Naomi Macias Honti

   • a01282098

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