The following are free-to-read books on user experience, available online:

Human Computer Interaction

• Mental Models in Human-Computer Interaction: Research Issues About What the User of Software Knows by John M. Carroll and Judith Reitman Olson
• HCI Models, Theories and Frameworks: Toward a Multi-disciplinary Science by John M. Carroll

User Experience / Interaction Design

• Search User Interfaces by Marti A. Hearst
• Designing Interfaces – Patterns for Effective Interaction Design by Jenifer Tidwell
• Thoughts on Interaction Design by Jon Kolko. with contributions from Ellen Beldner, Uday Gajendar, Chris Connors and Justin Petro
• The Fable of the User-Centered Designer by David Travis

Web Accessibility

• Just Ask: Integrating Accessibility Throughout Design by Shawn Henry
• Building Accessible Websites by Joe Clarke
• Dive Into Accessibility: 30 Days to a More Accessible Website by Mark Pilgrim

If there are any more you think need or can be added to the list, please leave a comment.

Under the Disability Discrimination Act 1995 (DDA), a disability is defined as:

A physical or mental impairment that has a long-term or substantial effect on a person’s ability to carry out day to day tasks.

This ranges from people with physical and sensory impairments to people with diabetes, disfigurements, heart disease and epilepsy.

Accessibility, therefore, can be viewed as the “ability to access” the functionality of a system or entity. Furthermore, accessibility is a somewhat general term used to describe the degree to which a product (e.g. device, service and environment) is accessible to as many people as possible. Accessibility is often used to focus on people with disabilities and their right of access to entities, often through use of assistive technology.

A dimension of accessibility is web accessibility. Web accessibility refers to the practice of making websites usable by people of all abilities and disabilities. When sites are correctly designed, developed and edited, all users can have equal access to information and functionality. In many countries this has led to initiatives, laws and regulations that aim toward providing universal access to the internet.

Digital Web Magazine has a great article on whether accessibility statements are useful, which is well worth a read.

The main points of consideration that can be garnered from the article are as follows:

1. Make the accessibility link prominent and provide it in a consistent location so that website visitors can find it easily.
2. Provide rich content that explains how to use the accessibility features provided, rather than just listing the features themselves.
3. Separate the content into sections and provide headings for each section.
4. Provide contact information in various formats so that website visitors can directly contact the team responsible for accessibility queries.
5. Actively promote feedback from website visitors. Use comments to continually improve the website.
6. Provide a known barriers section which details inaccessible areas of the website along with alternative ways of obtaining the information or services.
7. List technical and conformance information at the end of the accessibility statement. This will allow the information to be readily available, whilst not being placed in a prominent position.

Your accessibility statement will be organic — you may only start with a few lines but as your site develops in terms of accessibility, and your understanding of the accessibility of the site develops, so will your statement. As it can often be created and then forgotten about, it is worthwhile taking time every so often to check through the statement to ensure that it is up-to-date and reflects the work done to enhance the site’s accessibility.

Recent history suggests that open standards will again better the “walled gardens” of the Web.

In 1994, when the previously obscure computer network, developed by the American Department of Defence, first become known to the general public as the “World Wide Web”, or simply The Web, many people first connected to it via AOL and CompuServe. These subscription-based service providers offered not only access to the Internet, but other services such as email, chatrooms, discussion boards and more. It was access to the Web via the Internet that would lead to the undermining of these services, and the opening up of the Web as a platform for individual and creative expression, revenue generation and social interactivity.

Whilst it took some time for the closed communities to venture out into the wilds of the Web, it brought about the standardisation of the services that made up the early web. For instance, POP and SMTP standardised email and as a result it has become the ubiquitous tool of business. Today, of the early pioneers of the Web, only AOL survives, but as an entirely different entity; a web portal supported by advertising.

History appears to be repeating itself. The biggest online phenomena of the past couple of years, the social-networking websites of Facebook and MySpace, are acting very much like the AOL of the mid-1990s. They are closed systems based upon prioprietory standards. You cannot easily move information from one system or another if you so choose. This ties users into one system, or forces them to create profiles on both. A similar comparison can be drawn with the virtual worlds of Second Life and Entropia Universe.

The Web is better when it’s social.

Part of the reason these websites are popular is because they are closed communities, where users can interact with friends and find new friends with which to interact. This community feel has been tested in recent times, with sites such as Facebook being criticised for using their user’s personal data to target advertising. It is innevitable, however, that these systems are proprietory; it is only once these systems immerge and become popular that standards can be developed and implemented.

Just as the Web’s open standards, embodied in the Netscape browser, displaced the online services providers, so the paradigm of open standards awaits the social networking and virtual worlds. Back in the 1990s it was Netscape, but in the 21st Century it falls to Google to defend the open standards of the Web with the Open Social API. Some say there is a large amount of self interest in this move, since Facebook and MySpace have huge communities, which both networks know a huge amount more about than Google and can hence generate billions of dollars of revenue.

The web is more interesting when you can build applications that easily interact with your friends and colleagues. But with the trend towards more social applications also comes a growing list of site-specific APIs that developers must learn. Open Social is an attempt not only to open up the closed communities and allow developers to interact with the different networks, but allow developers to only learn one API. MySpace has signed up to this initiative and, more reluctantly so has Facebook. A curiosity is AOLs recent aquisition of Bebo, another online community popular in Europe. Is AOL simply jumping on the “band-wagon”? Has it learnt its lessons of the past, or is it using knowledge of its past as a guiding principle? Whatever is the answer, Bebo’s inclusion in Open Social will help it continue its competition with other social networking websites.

You can read the full press release on the Web Standards Project website.

Widening the collaboration between standards experts, who are also product experts, and Adobe is an exciting step forward in the maturation of the Web. This will hopefully lead to full standards support in not only Adobe-based products such as Dreamweaver and AIR, but leading browser and web editor suppliers such as Mozilla, Microsoft and Apple.

Websites are increasingly the key communication vehicle for a company, its brand and products. Despite this, research from Magus shows that many of the world’s leading organisations don’t have formal brand and technical standards defined to govern their websites. Even those that do are failing to effectively implement or enforce them, achieving full compliance with less than 20% of their own web standards. The websites of these organisations significantly under-perform or damage the brand as a result.

PAS 124 will help to protect the significant investment organisations are making in their web presence and online brands, by establishing best practice for “defining, implementing and managing organisational web standards”. It will provide a clear framework to help organisations apply standards effectively to significantly improve online performance and protect the integrity of their brands.

More detail can be found on the BSI’s press release.

Microsoft Silverlight is a proprietary runtime for browser-based Rich Internet Applications, providing a subset of the animation, vector graphics, and video playback capabilities of Windows Presentation Foundation. The runtime is available for Microsoft Windows and Mac OS X, with Linux support under development via the third-party Moonlight runtime.

Microsoft describes its advantages as follows:

Compelling Cross-Platform User Experiences

• Deliver media experiences and rich interactive applications for the Web that incorporate video, animation, interactivity, and stunning user interfaces.
• Seamless, fast installation for users, thanks to a small, on-demand, easy-to-install plug-in that is under 2 megabytes (MB) in size and works with all leading browsers.
• Consistent experiences between Windows-based and Macintosh computers without any additional installation requirements.
• Create richer, more compelling Web experiences that take greater advantage of the client for increased performance.
• Stunning vector-based graphics, media, text, animation, and overlays that enable seamless integration of graphics and effects into any existing Web application.
• Enhance existing standards/AJAX-based applications with richer graphics and media, and improve their performance and capabilities by using Silverlight.

Flexible Programming Model with Collaboration Tools

• Based on the Microsoft .NET Framework, Silverlight enables developers and designers to easily use existing skills and tools to deliver media experiences and rich interactive applications for the Web.
• Simple integration with existing Web technologies and assets means Silverlight works with any back-end Web environment or technology. No “rip and replace” required.
• Silverlight integrates with your existing infrastructure and applications, including Apache, PHP, as well as JavaScript and XHTML on the client.
• Choice of development languages including JavaScript, Ruby, Python, C#, Visual Basic .NET, and more.
• Role-specific tools for both designers and developers that take advantage of Web standards and the breadth of the Microsoft .NET connected software features.
• For designers: Microsoft Expression Studio for creating interactive user interfaces and media rich experiences, preparing media for encoding and distribution, and creating World Wide Web Consortium (W3C) standards-compliant sites using modern XHTML, XML, XSLT, CSS, and ASP.NET.
• For developers: Microsoft Visual Studio for developing client and server code with full Microsoft IntelliSense, powerful cross-platform debugging, rich language support, and more.
• Consistent presentation model by using XAML, the declarative presentation language used in Windows Vista–based applications. Controls, visual designs, media, and other elements can be presented with full design fidelity in both Silverlight and Windows-based applications.
• Extensible control model makes it easy to add rich content and behaviors while enabling efficient code-reuse and sharing.
• Dramatically improved performance for AJAX-enabled Web sites with the power, performance, and flexibility of Silverlight and .NET-connected software.

High Quality, Low Cost Media

• Unified media format that scales from high definition (HD) to mobile with Windows Media Video (WMV), the Microsoft implementation of the Society of Motion Picture and Television Engineers (SMPTE) VC-1 video standard, as well as support for Windows Media Audio (WMA) and MP3 audio.
• Add vector-based graphics and overlays to media with support for integration of graphics that scale to any size and broadcast-style overlays for tickers and closed captioning.
• Flexible ad-insertion solutions with video and animation, including the ability to deliver fluid, broadcast-style video or animated advertisements without loss of visual fidelity or motion quality.
• Lower-cost media streaming with Emmy Award winning Windows Media technologies that can lower the cost of streaming delivery by up to 46%, and enjoy the flexibility to work with your existing Windows Media streaming deployments. Even further cost reductions are possible with the upcoming Microsoft Internet Information Services (IIS) Media Pack for Microsoft Windows Server 2008.
• Broad ecosystem of media tools, servers, and solutions compatible with the Windows Media operating system.
• Microsoft PlayReady content-access technology that delivers a single solution for digital rights management support on both Windows-based and Macintosh computers for content providers (coming in Silverlight 1.1)
• Powerful encoding tools for live and on-demand publishing of media experiences with Microsoft Expression Encoder, including hardware-accelerated encoding of WMV and VC-1 at up to 15 times the performance of software alone when paired with a Tarari Encoder Accelerator board.

Connected to Data, Servers, and Services

• Mash-up and incorporate services and data from the Web by taking advantage of the Silverlight support for LINQ while accessing that data with common protocols like JSON, RSS, POX, and REST.
• Increase discoverability of rich interactive application (RIA) content that can be indexed and searched due to the text-based XAML format that describes interface and content in a Silverlight-based application.
• Rapidly scale applications with Silverlight Streaming by Windows Live to host and integrate software services and media content.

Streaming audio and video

• Silverlight Streaming by Windows Live offers a free streaming and application hosting solution for delivering high-quality, cross-platform, cross-browser, media-enabled rich interactive applications (RIAs). With the ability to author content in Microsoft Expression Encoder and other third-party editing environments, Web designers maintain complete control of the user experience.

It is clear that RIAs offer the potential to fundamentally change the user experience and in doing so, yield significant business benefits. However, in order for RIAs to be widely employed, and for more companies to receive these kinds of returns, technologies to build RIAs will need to appeal to a wider range of developers. The ability to cost effectively create rich, engaging user experiences that support corporate objectives and reach a broader developer audience without sacrificing development productivity require a new generation of RIA tools. These tools are being developed by a large number of organisations with Adobe, Microsoft, Google, Apple and Sun leading the way with the AIR/Flash/Flex combination, Silverlight, Gears, Quicktime and JavaFX respectively.

The new generation of RIA tools being developed by the likes of Adobe and Microsoft must do the following to allow developers to truely harness the power of RIAs in the commercial environment:

1. Allow developers to write applications using familiar development models to utilise and extend their current skills without requiring them to adopt entirely new or different skills
2. Use standard and standards-based technologies
3. Use industry specific programming models and patterns
4. Use and/or leverage the existing IT infrastructure through wrap and reuse rather than rip and replace
5. Provide pervasive, familiar programming models and an expressive user interface across platforms and devices; and
6. Allow developers to create a solution that delivers scalable, secure, high performance solutions that are bandwidth efficient

These new RIA tools will need to provide the features that enhance IT developer’s abilities to be more creative and to accomplish RIA development with the same or less effort than the tools they use to create other types of applications. What is required are the tools that can help developers achieve these objectives without relying on only HTML or other scripting languages, or having to learn a completely new development approach.

Two vendors which have the technology and capaibility to fully deliver Rich Internet Applications are Adobe and Microsoft. With Microsoft’s Silverlight and XAML, developing rich internet applications to run on Windows platforms will progress at a fast rate. In turn, Adobe has had a head start with the aquisition of Macromedia and the subsequent addition of Flash and Flex to its product offering. Flash and its relative ubiquity across platforms and devices ensures that RIA development and production will be accessible to a large user base and as such puts Adobe at a distinct advantage over Microsoft.