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Lecture 3 Part I

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الكلية كلية تكنولوجيا المعلومات     القسم قسم البرامجيات     المرحلة 4
أستاذ المادة احمد حبيب سعيد العزاوي       28/10/2012 11:32:44
Overview:
? Interaction models help us to understand what is going on in the interaction between user and system. They address the translations between what the user wants and what the system does.
? Ergonomics looks at the physical characteristics of the interaction and how these influence its effectiveness.
? The dialog between user and system is influenced by the style of the interface.
? The interaction takes place within a social and organizational context that affects both user and system.
In this lecture, we consider the communication between user and system: the interaction. We will look at some models of interaction that enable us to identify and evaluate components of the interaction, and at the physical, social and organizational issues that provide the context for it.
MODELS OF INTERACTION
1. The terms of interaction
Traditionally, the purpose of an interactive system is to aid a user in accomplishing goals from some application domain. A domain defines an area of expertise and knowledge in some real-world activity. Some examples of domains are graphic design, authoring and process control in a factory. A domain consists of concepts that highlight its important aspects. In a graphic design domain, some of the important concepts are geometric shapes, a drawing surface and a drawing utensil.
Tasks are operations to manipulate the concepts of a domain.
A goal is the desired output from a performed task.
2. The execution–evaluation cycle
Norman’s model of interaction is perhaps the most influential in Human–Computer Interaction, possibly because of its closeness to our intuitive understanding of the interaction between human user and computer. The user formulates a plan of action, which is then executed at the computer interface. When the plan, or part of the plan, has been executed, the user observes the computer interface to evaluate the result of the executed plan, and to determine further actions. The interactive cycle can be divided into two major phases: execution and evaluation. These can then be subdivided into further stages, seven in all. The stages in Norman’s model of interaction are as follows:
1. Establishing the goal.
2. Forming the intention.
3. Specifying the action sequence.
4. Executing the action.
5. Perceiving the system state.

المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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