前言
如今,以用户为中心的设计已经嵌入在许多设计作品中。本文旨在探讨这种方法的性质。这篇文章分为四个部分。
第一部分为以用户为中心的设计提供一个定义,第二部分以举例子的方式解释使用这种方法的好处。接下来将继续讨论以用户为中心的设计的局限性，随之对以用户为中心的设计进行总结。
以用户为中心的设计是什么?
以用户为中心的设计旨在提高产品的可用性,从而使他们更有效地满足用户的需求。这种方法需要设计师极其细心地关注用户的需求。
“产品规划、设计和开发”(UPA资源,没有日期)诺曼(1999)对以用户中心的设计进行了相关的描述，将其定义为“将复杂的任务转化为简单的任务的重要方法。它要求设计师在进行产品设计之前对用户对象进行深入的研究探讨。
Introduction
Nowadays, User Centered Design has been embedded in many design works. This essay seeks to explore the nature of this approach. This essay is split in to four sections.
The first section is to provide a definition for User Centered Design while the second section will explain the benefits of using this approach with examples. I will then move on to discuss the limitations of User Centered Design and a conclusion will come afterwards.
What is User Centred Design?
User Centred Design is an approach which aims at increasing the usability of products, and therefore making them more effective in meeting users' needs. This approach requires the designer to focus on the users throughout
'The planning, design and development of the product.' (UPA resources, no date) Norman (1999) described user centred design as 'Transforming difficult tasks into easy ones.' It requires the designer to study the users before designing.
User Centred Design approach often requires a great deal of involvement from the users during the process. Carrying out this approach often includes collecting end users' opinion right before the start of the project, as well as during the design process, and designing with them. The objective of this is to allow the designers to have a good understanding of the subjects who will use the product. Therefore, good interaction between designers and users is the key under this approach.
UCD is widely recognized and there is an international standard which serves as a benchmark and a guideline. International standard ISO 13047:Human-centered design process outlines the 5 stages of a typical UCD design, which are identifying need for human centered design, specifying the context of use, specifying requirements, creating design solutions and evaluating designs. (UPA Resources, no date) These steps define only general procedures but not exact methods. In fact, these standards do not outline how each phrase should be carried out. For instance, specifying the context of use can be done by surveys, observations, interview and many other methods.
Advantages of User Centred Design
Norman (1999) first suggested UCD is essentially a series of procedures that simplifying difficult tasks through exploiting natural properties of people and of the world, simplifying the structure of tasks, making both execution and evaluation sides of an action visible, exploiting natural constraints and designing for error. Aesthetics is not considered as a need in his original definition of UCD.
Needs of end-users in study during a UCD process should not be only those associated with functions of a product, but also users' unexpressed needs including, but not limited to, needs for aesthetics. Norman (2004) introduced three levels of user centered design namely Visceral design, Behavioral design and Reflective design.
Visceral design is about the appearance of the product which aims at capturing people's attention that they would never forget it or replace it with others. A design that people love it when they see it the first time is a successful visceral design.
The Muji Bath Radio is essentially a radio which is designed to be used in bathrooms and it fits in with the bathroom with a playful element. This product is designed by Industrial Facility. It is fun only when it gathers with the Muji refillable shampoo bottle, they appear to be a family; the bottle itself and even the label of the shampoo are of the same size with the speaker of the radio. Using it is very straightforward, simply turning the top to adjust the volume and on or off while the AM and FM tuning section is at the bottom. The radio is sealed to ensure it is water resistant to protect the radio due to the environment that it is being used (Fig. 1-3). (Industrial Facility, 2009)
Behavioral design is the functional part of a design. The product needs to be functional and easy to use. Norman suggested that even some products are complicated and users need to learn how things works but it should be learnt once only.
Apple increased the usability of Mac computers by making the interface of software written for Mac OS similar. Therefore, once the basic controls are learnt, users can manage a variety of software for this system easily and quickly.
Another good example would be hook-and-loop fastener which makes tying shoes easier and serves as an alternative to shoelace. It is also a design that focuses on users. Tying a shoelace is an everyday but potentially difficult task for children and infirm adults due to its inherent complexity. Hook-and-loop fasteners simplify tying shoes and provide an easy alternative to shoelaces. Many may argue that this example is not significant but as Norman (1999) suggested; this simple design caters the needs of users and solves the difficulties of a large segment of population.
Reflective design is about the message the product gives to the user and the way the product represents the person who uses it. Sometimes people buy a product is not for the physical outcome but the psychological outcome. The main selling point of this type of design is not their functionality but things like prestige that owning the design brings. For instance, People drink Fair-trade coffee may not really concern about the farmer's benefit in the third world. They may do so to show to others how kind and generous they are.
Nowadays, many businesses have incorporated this ideology into their product range. Creating products which consumers actually need and want often feeds through to higher sales and hence higher profit. Brand image will also be benefitted. One of the key benefits of UCD approach is that it allows designers to attain some level of understanding of the users' needs. According to Parsons in 'Blueprint November 2009' (2009, p.54), before UCD is being widely adopted, designers have to use their experience and knowledge to guess the needs of users. This in turn may create a mismatch between the product and the needs of end-users. UCD ensures efficient use of time and resources.
Limitations of User Centred Design
However, UCD is by no means a perfect model and may not be the ideal solution in some cases. I am going to illustrate the limitations and disadvantages of UCD in the following paragraphs.
UCD is often characterized as time-consuming and costly. Many UCD designers believe that market research is generally not an appropriate way to understand the behavior of the end users. Users may not do what they told market researchers and there are often unexpressed needs such as those associated with "attractiveness" and aesthetics. For the sake of gaining a full and reliable understanding, UCD designers often observe their users directly such as observing how end-users actually carry out specific tasks. Observing a range of subjects can be expensive and definitely takes a great deal of time as well as effort. However, it is possible these observations are subjected to Hawthorne Effect whereby individuals change their behavior when they know they are observed. (Campbell, Maxey and Watson, 1995) These observations may not be reliable after all.
Moreover, end-users may not know what they truly need. They may not know if they really need or desire the product until they actually see it. Therefore, participation of users in the earlier stages may not be too helpful.
Furthermore, without the technical background as a professional designer has, what users think might work might not work in practice. Also, too much commitment to satisfy the needs of a particular targeted users group may overly complicate the design which reduces its usability by other users.
Norman (2005) suggested that 'If a user suggestion fails to fit within this design model, it should be discarded.'
A balance between doing what consumers want and maintaining the usability should be achieved.
UCD is an ideology, which is the manifesto of many designers. However, usage of UCD procedures does not guarantee the product is useful for the users. Although there is an international standard which outline the general structure for typical UCD projects, the methods to go about these procedures are decided by the designer. Besides, due to time and budget constraint, designer can only study the behavior of a particular sample. There is again no guarantee the sample is representative for all the targeted users since everyone's needs are somewhat different. In addition, the sampling method used directly determines the reliability of these observations.
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