东北大学用户界面测评实例

User-Centered Design Example

 You have been hired by Pizzas R Us (PRU)

 Design a system to

 make online orders from the web

 Also considering special features

 online discount coupons（折价券）

 allowing party orders in advance

 customer recommendations, linking to reviews

workers.

 This is the needs assessment.

 Techniques:

 Observation

 Interview

 Study existing successful designs

 Observation

 Visit one or more pizza parlors. Observe how people achieve their pizza

ordering goals.

 Observe what the counter（柜台） people need to do. Optionally: interview

 Try to identify people with different needs and preferences, with

respect to their attitudes about using online ordering systems.

 Ask them what, if anything, must be in the system in order for them to

prefer it over a phone ordering system or an in-person ordering system.

(E.g., no busy signals, cheaper prices, comparison shopping, faster service, or would they

prefer anything over current methods.)

 Go look at at least one existing on-line food ordering web site and see how

they handle these tasks.

 Consider existing designs

 Look at least one existing on-line food ordering web site and see how they

parlors and via phone orders

 Make a table showing

 user types

 tasks

 (guesses about) relative frequencies of tasks

interface.

 Make note of which ideas you decided to drop based on your

 Where are the tasks performed?

 What is the relationship between the user and the data?

 What other tools does the user have?

 How do users communicate with each other?

 How often are the tasks performed?

 What are the (time) constraints on the task?

 What happens when things go wrong?

Task Analysis

 Characterize what happens when users perform typical tasks

 Tools:

 Frequent users remember more details

 Infrequent users may need more prompting

 Which function is performed

 most frequently?

 by which users?

Augment Table with Percentages(What percentage of the is this task done by this person)

(Numbers are only suggestive, adapted from Shneiderman 98)

 Scenarios

 Create three scenarios that will exercise these tasks in the proposed interface

 Create a description in which you outline

 A person’s background

 Their goal(s)

 How they achieve these goals using the steps in the system

screens.

 Walk through at least one of the scenarios you developed and show how it

can be handled by the interface.

Online Pizza Ordering Example

 By Masako Sho

 Overview

 Based on the task analysis of pizza ordering and the study of existing food

ordering web sites, it is found that users prefer quick and easy access, as well

as additional online features when ordering pizza.