Task Centered Design

اه هفیظو یانبم رب یحارط

What’s the Task Centered Design?

Task-Centered Design is a technique used to design user interfaces with a high degree of usability.

Task-Centered Design is important because:

Usability is measured by how well user’s are able to complete their tasks successfully.

The steps in the task-centered design process are as follows:

          

Task and users analysis Choose representative tasks for task-centered design Plagiarize Rough out a design Think Create a mock-up or prototype Test with users Iterate Build Track Change

1.

Task and users analysis

ناربراک و فیاظو زیلانآ

Figure out who's going to use the system what to do.

Close personal contact between members of the design team and the users.

Merge user's existing world and work.

2. Choose Representative Tasks هدنیامن ناونع هب هفیظو دنچ باختنا Representative tasks:

Tasks that users have actually described to the designers The representative tasks can later be expanded to any level of detail

Examples



For a word processor: "transcribe a memo and send it to a mailing list"



For a spreadsheet: "produce a salary budget for next year"



For an industrial control system: "hand over control to next shift"

3. Plagiarize

) یرادرب وگلا ( یبدا تقرس

Find existing interfaces that work for users and then build ideas.

What programs are those users in similar situations, using now?

4. Rough Out the Design

یلک یدنب بلاق

A lot of discussion about the features of system and how they should be presented to the user.

This discussion guided by the task centered design approach.

Specify the sub tasks of each representative tasks to make sure the system is complete.

5. Think about it

تخاس زا لبق زیلانآ

There are several structured approaches you can take to

discover the strengths and weakness

of an interface before its building.

6.Create a Mock-Up or prototype هنومن شیپ ای تکام کی نتخاس Build something more concrete that can be shown to users and can act as a more detailed description for further work.

7.Test the Design With Users

ربراک هلیسو هب حرط تست

The testing should be done with people whose background knowledge or real users.

We should ask users to "think aloud“ because this will provide important clues to why the errors were made.

8.Iterate

ندرک رارکت

Purpose of testing: not to prove the interface, but to

improve it.

When should the iterations stop? If you've defined specific usability objectives

9.Build the Design

حرط نتخاس

The key guideline in building the interface is to build it for changes.

Anticipate minor changes with easily changed variables And major changes with code that is clearly modular.

10.Track the Design

ندرک ینابیتشپ

Continued awareness of users and their real needs are a key requirement for a good designer.

Interactions with users can also yield surprises about other applications that have been found for the product, possibly opening up new market opportunities.

11

. Change the Design

نداد رییغت

Tasks and users both change.

The next revision of the design should be a response not only to problems but also to opportunities.

Thanks for your attention