Card sorting

Draft

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Introduction

According to Donna Spencer and Todd Warfel, “Card sorting is a quick, inexpensive, and reliable method, which serves as input into your information design process. Card sorting generates an overall structure for your information, as well as suggestions for navigation, menus, and possible taxonomies.”

Typical information that can be found is:

• How do users want to see the information grouped, e.g. by various subjects, by processes, by type of information, etc.
• How many main categories can be identified
• Are there different groups of users with different needs ?

Alternative methods:

• Affinity diagram

There exist two primary variants:

In Open card sorting, the most popular method, the participants are given cards with no pre-established groupings. In closed card sorting, participants are asked to place cards into existing groups. Below we shall describe open card sorting.

Open card sorting method

Card sorting can be performed with a software tool or physical cards. According to most practitioners, physical cards provide better results. However, using an online program allows to bring distance participants and the whole preparation and analysis process is faster...

Preparation

Card sorting can be performed by individuals or small groups. Group sorts provide for richer data, since participants are likely to discuss and the designer can listen in. Individuals however may provide a more accurate variety of views. It is probably better to do group sorts in an early planning stage and individual sorting in a later stage, in particular if you are planning to create a large and complex web site.

Prepare a list of items that summarize all the information and services you plan to have in your website. These items can be collected from early requirements documents, from other similar websites, from brainstorming, etc. Typically you should have between 30 and 100 items.

Create a card for each item. Make sure that the cards are large enough so that participants can read it when spread out. If the meaning of items is not obvious, then you can print an explanation underneath or in the back.

The sorting procedure

(1) Shuffle the cards (each participant/group should get them in a different order)

(2) Ask the participants to group items in a way that makes sense to them.

(3) Ask participants to name the resulting groups of cards.

Analysis

Firstly find out whether there is a large consensus on the global structure (groupings and labels. In particular pay attention to items for which consensus doesn't exist or participants who see things differently.

Spreadsheets can show how often a card shows in a category, etc.

Various statistical techniques may be used identify clusters.

See various software tools listed below ....

Tools

Online tools and services

• optimalsort (commercial online card sorting tool, with a free account you get 10 people with 3 tasks each for Treejack and Chalkmark, or 30 cards for OptimalSort).
• websort (commercial online card sorting tool, free for a 10 participants limit)
• Web Category Analysis Tool (WebCAT) (2005). Lets the usability engineer quickly construct and conduct a simple category analysis across the web. It is a variation upon traditional card sorting techniques.
• User Experience Suite Includes online card sorting (auf Deutsch/German only)

Spreadsheets

• spreadsheet to analyse card sort data

Software

• The method of sorting (Generic sorting software)
• xSort is a free card sorting application for Mac OS X only. Assists both card sorting and various can of analysis.

Links

Indexes of articles

• Card sorting list of introductory and discussion articles, by Dey Alexander.

Introductions

• Card sorting at usabilitynet.net. A short introduction.

• Card Sorting Another short intro at usabilityfirst.com

• Card sorting: a definitive guide, by Donna Spencer and Todd Warfel on 2004/04/07

Videos

Card sorting for defining the information architecture

• Excerpts from a two-day card sorting workshop, (2min20s on Vimeo), conducted by Jayson Elliot in 2010. Several groups of three users at a time were asked to sort cards representing content from a client's web site into piles that they felt were associated with each other. At the end of each session, the groups would switch places with another group of three people, and asked to edit the last group's work.

By observing the interactions, listening to users' conversations, and compiling data on how cards were sorted, we were able to gain valuable insights into the ideal structure and taxonomy of the website.

Other uses

• Bea - Card Sort. This video demonstrates another kind of card sorting. Users receive cards that describe requirements and have to sort these according to priority.