Abacus Web Usability
- Consultants to help you improve the user friendliness of your web site, located in Florida, USA.
- http://www.abacuswebservices.com/

Clickdensity
- Offers a tool to record the position of every click on a web page, creating a virtual heat map of visitor activity. Includes details of benefits and how it works, together with a free demonstration.
- http://www.clickdensity.com/

Incontext Enterprises
- Provides design, training, and market information services. Located in Massachusetts, USA.
- http://incontextdesign.com

Serco Usability Services
- London, UK based independent usability consultants, covering websites, interactive TV, interactive appliances and mobile Internet devices.
- http://www.serco.com/usability/

ePerformance Consulting
- Consulting services covering usability, information architecture, user experience design, search engine optimisation and complete website design. Located in the UK.
- http://www.eperformance.co.uk/

Dreamstep Design
- User Centered approach to interface analysis and design.
- http://kevinbury.com

Centralis
- A user experience consultancy offering research, testing and design expertise to develop interactive applications. Located in Illinois, USA.
- http://www.centralis.com

Foolproof Business Services
- Examining the online sales process from the customer's point of view. Located in England.
- http://www.foolproof.co.uk

Experience by Design
- Washington, DC based information architecture and user experience consultancy for websites & software.
- http://www.experiencebydesign.com

Usablity Glossary
- Boston Web firm offering information architecture, interaction design, usability consulting, and copywriting.
- http://www.bobgoodman.net/main/glossary.html

KeyLabs Software Testing Products and Services
- KeyLabs is an independent testing lab providing web site application performance testing.
- http://www.keylabs.com

Idean Research
- Offering user experience research services and consultation in usability for the products of the digital world, especially wireless ones. Located in Finland.
- http://www.ideanresearch.com/

Design Interpretive
- Integrated delivery of user interface design, industrial design, and usability assessment and testing services. Located in Ottawa, Canada.
- http://www.designinterpretive.com/

Erik More
- User experience consulting services focused on usability engineering, information architecture, and interface design. Located in California.
- http://www.erikmore.com

Cox & Hall Interaction Design
- Texas design consultantancy specializing in user interface and interaction design, visual communication, and usability for products requiring human-computer interaction.
- http://www.coxhall.com

gotomedia, inc. - interaction design and usability consulting
- Offers customized user experience and branding solutions. Notable clients include Macromedia & WebEx.
- http://www.gotomedia.com

Effortmark Ltd.
- Usability Consulting firm based in Leighton Buzzard, UK. Focuses include making web sites and particularly web forms easier to use.
- http://www.effortmark.co.uk

Usability by Design Ltd
- Offering usability and design consultancy to the e-commerce and client server markets in Europe. Located in London, United Kingdom.
- http://www.usability.uk.com/

fhios
- Offers user research and services for the complete design and development process including usability testing. Based in London, United Kingdom.
- http://www.fhios.com

flyTrap Interactive
- Offers user interface design services at all phases of application development, including working prototypes for web and interactive multimedia applications. Based in San Diego, California, United States.
- http://flytrapinteractive.com/

Sliced Bread Interaction Design
- User interface design consultancy creating online, desktop, and handheld products and services. California, United States.
- http://www.slicedbreaddesign.com/

Jeff Brace Design
- Consulting services include business analysis, information architecture, user interface design, and usability evaluations. Located in British Columbia, Canada.
- http://members.shaw.ca/jeff.brace/

Interaction Architect
- Sim D'Hertefelt offers services for designing usable interactive systems, includes articles. Located in Belgium.
- http://users.skynet.be/fa250900/

Experience Research - Richard Linington
- Ethnographic research leading to the creation of useful and desirable user experiences. Located in the United Kingdom.
- http://www.experienceresearch.com/

Fields, Jason: air-port
- Evolving technology and delivering a more compelling and dynamic digital experience to end users online and offline. Based in California, USA.
- http://www.air-port.com/

Membex
- Specializing in interface design, usability testing, site development, database architecture, and ecommerce sites. Located in Pennsylvania, USA.
- http://www.membex.com/

Pamam
- Solutions for user interface design and human factors engineering. Located in Israel.
- http://www.pamam.com/

Usable Interface
- The portfolio and resume of Kyle Pero, a usability analyst, interaction designer, and information architect consultant based in Pennsylvania, USA.
- http://www.usableinterface.com

Vista Point Consulting
- Provides web site design and evaluation services for small and mid-sized businesses. Focus on usability, customer-focused content and clean design. Based in Renton, Washington, United States.
- http://www.newvistapoint.com/

Information & Design
- Offers usability consulting. Includes resources, articles and courses. Located in Melbourne, Australia.
- http://www.infodesign.com.au/

Web Site Optimization, LLC
- Consulting firm offering Web optimization services and information. Located in Michigan, USA.
- http://www.websiteoptimization.com

Evan Media
- Creation of user-centered interface designs, websites and custom web applications for small to mid-size businesses. Located in California, USA.
- http://www.evanmedia.com/

Shiro Wilde
- Interaction Designer
- http://www.freshgoods.com/projects/

Andrew Fox Interactive
- Design, usability and consultancy. Located in the United Kingdom.
- http://www.andrewfox.co.uk/

Nat Bobbitt's Laboratories
- Research and IT consulting expertise in the assessment of information systems for: ERP, CRM, CMS, DBMS. Located in Colorado, USA.
- http://www.nabslab.com/

Quakenbush Design
- Interface Design consultation for browser-based and traditional software as well as interactiveTV.
- http://www.q-design.com/

Reynolds, Louis
- Information architect and GUI consultant, specializing in information architecture, user testing, user experience, and GUI design. Located in New Jersey, USA.
- http://www.louisreynolds.com/

Aptima, Inc.
- Providing innovative research and applied design for government, industry, medical, and transportation fields. Locations in Washington DC and Massachusetts, USA.
- http://www.aptima.com/

The Communication Studio LLC
- Seasoned interaction designer: documentation, graphics, wireframe models, best practices & information architecture. A unique combination of business understanding, technical acumen, creative talent and strategic insight. Experienced in transactional
- http://www.jcvtcs.com/index.html

Acernus
- Provides usability services as well as site design and site creation services for web based companies.
- http://www.acernus.com

Eleven Consulting
- Helps companies determine product strengths and weaknesses, and gives specific, blueprint-level guidance on how they can be improved. Located in California, USA.
- http://www.elevenconsulting.com/

Reuten
- Offering information architecture, user experience and usability evaluation services. Located in Melbourne, Australia.
- http://www.reuten.com.au/

Catalyst Group Design
- Usability and User Interface Designers. Located in New York, USA.
- http://www.catalystgroupdesign.com/

Gothelf, Jeff
- Representation of the disciplines of information architecture, business analysis and usability, as well as contact information and a resume. Located in Massachusetts, USA.
- http://www.jeffgothelf.com

mProver
- Website usability reports and email support. Located in New York, USA.
- http://mprover.com/

Ferguson, Louise
- Consulting services to research, design, and evaluate interactive products. Specialist in medical usability, wireless systems and complex collaborative environments. Located in the UK.
- http://www.louiseferguson.com/

Usability Partners
- Independent usability and user-centred design consultancy, based in Stockholm, Sweden.
- http://www.usabilitypartners.se/

The TerraNova Group
- Specializing in user interface design, ethnography, usability evaluations, and user support systems. Located in Georgia, USA.
- http://www.terranova.tv/

The Hirsch Group
- Specializing in the conceptualization, design, development, evaluation, review and assessment of human-computer interfaces, especially web-based applications. Located in California, USA.
- http://www.thehirschgroup.com/

Nuno Design
- Offering user-centered interface design, auditing, and prototyping solutions for online and MS Windows applications. Located in Ireland.
- http://www.nuno.ie/

Crystal Point Consulting
- Helps businesses sharpen their websites. Provider of website analysis, reality testing, training seminars, and consulting services. Located in Illinois, USA.
- http://www.crystalpointconsulting.com/

NetRaker Corporation
- Provides an online suite of website evaluation tools to help businesses understand and manage customer intentions, attitudes, and behavior. Headquartered in California, USA.
- http://www.netraker.com/

Tec-Ed, Inc.
- Customer research, information architecture and design, and usability evaluation of technology products and websites. Offices in Michigan, California, and New York, USA.
- http://www.teced.com/

NerveCentral
- A web usability and solutions consultancy, offering user-centered ergonomic design and web development. Located in the UK.
- http://nervecentral.com

Interacta Design Oy
- Specializes in goal-based user interface design and field studies to find out the users' goals. Provides usability assessment, e.g. expert reviews and usability testing. Located in Finland.
- http://www.interacta.fi/

Pure Interface
- User interface design, usability testing and research to improve user experience for websites, software, and other products. Locate in the United Kingdom.
- http://www.pureinterface.com/

ThoughtCap
- Internet consultancy committed to helping Global 2000 clients leverage customer experience as a competitive advantage and driver of profits. Located in New York City.
- http://www.thoughtcap.com/

Software Human Factors
- Provides a wide range of usability consulting services including interface design, user testing, focus groups, heuristic evaluations and onsite training.
- http://www.softwarehumanfactors.com

Siteworkz Consulting
- Provides services in Web Design, Information Architecture, specializing in web usability. Located in Canada.
- http://siteworkz.com

Tmtm
- Offers services to create meaningful digital product development and user experience. Located in London, UK.
- http://www.tmtm.co.uk

Human Interface Group
- User-centered user interface design, user documentation and training services. Belgium
- http://www.higroup.com/

Joe 10 Group
- Interface design and usability consulting firm which applies user centered design strategies to help businesses improve the user experience of their Web sites and consumer products. Located in California, USA.
- http://www.joe10.com/

Pure Usability Ltd
- Web usability and accessibility consultancy. Based in the UK.
- http://www.pureusability.co.uk

Gruden
- Provides website design and development solutions for internet, extranet, intranet, multimedia and new media projects.
- http://www.gruden.com

Amberlight Partners Ltd.
- Helps corporations achieve specific business results by providing research, and a user-centred approach to the design and use of digital technologies. Located in the United Kingdom.
- http://www.amber-light.co.uk/

Gravity7
- Award-winning web site development, user interface, user experience consulting and communication design. Includes short articles. Located in California, USA.
- http://www.gravity7.com

Black Box Media
- A website and CDROM publishing company specializing in human factors for interface design, usability and usage studies, navigation and information architecture - directly for clients or through larger companies. Located in Canada.
- http://www.black-box-media.com

Truth In Design
- Consultants who design user experience in the shape of graphical user interfaces on the internet and in the wireless world. Located in California, USA.
- http://www.truthindesign.com

Flash 99% Good
- Usability for Flash. Promotes mainly a book, and includes tips, tutorial, and links.
- http://www.flash99good.com/

Maskery
- Offers user centred research and design services, specializing in concept design, usability, accessibility product evaluations, and training. Located in Ottawa, Canada.
- http://www.maskery.ca

Snyder Consulting
- Usability and prototyping consultant focused on helping customers recognize, prioritize, and solve usability problems. Located in New Hampshire, USA.
- http://www.snyderconsulting.net/

Usability Sciences Corporation
- Provider of usability testing and research for websites, consumer electronics, software and hardware products. Located in Texas, USA.
- http://www.usabilitysciences.com/

Bohmann Usability
- User experience consulting. Including articles and news about Web usability. From Denmark.
- http://www.bohmann.dk/

User Insight
- Provider of user experience services utilizing usability testing, focus groups, market research, training and documentation. Located in California, Georgia, and Illinois, USA.
- http://www.userinsight.com

Zanzara User Experience
- Offers usability testing, UI design and customer research services. Located in Washington, USA.
- http://www.zanzara.com

Enervision Media
- Provides analysis and designs interactive systems and interfaces for usability across all technology platforms. Located in New York, USA.
- http://www.enervisionmedia.com

Sotopia
- Usability consultant specialized in user centered design, including computer interaction, and usability engineering. Located in Rotterdam, Netherlands.
- http://www.sotopia.com/

Preston G Smalley
- Offers services in interaction design and software engineering. Located in California, USA.
- http://www.prestonsmalley.com/

Two Rivers Consulting Corporation
- A consulting firm in Massachusetts.
- http://www.tworivers.com/

Sage Consulting
- Silicon Valley based computer human interaction consultancy focusing on practical usability testing & interface design. Located in California, USA.
- http://www.sage-research.com/

Anderson, Richard I.
- Provides guidance in collaborative, user-centered design, ethnographic research, and multidisciplinary collaboration. Located in California, USA.
- http://www.well.com/user/riander/

Emma Jane Consulting
- Offers web and interface design plus user studies.
- http://www.emmajane.com/

UsabilityOne
- Offers a range of services with a focus on user interfaces for web and non-web applications. Services available throughout the Asia Pacific. Located in Australia.
- http://www.usabilityone.com

Enflexion
- Australia-based consulting group specialising in eBusiness usability and accessibility.
- http://www.enflexion.com.au/

Instrata
- Offers services to study user behaviour and apply results to create functional and usable user interfaces. Located in the UK.
- http://www.instrata.co.uk/

Performance Research and Design
- Offers user-centred design services for product development, including usability testing, survey research, user-centered design and focus groups. Located in New York, USA.
- http://www.prad.com/

Nielsen Norman Group
- Consulting agency offering to enhance the user experience. Includes news, events and publications. Located in California, USA.
- http://www.nngroup.com/

Cognetics Corporation
- Offers a Logical User Centered Interaction Design (LUCID) Framework, a methodology for managing the design and testing of the software user interface. Located in New Jersey, USA.
- http://www.cognetics.com/

Good Experience
- Mark Hurst and Creative Good present white papers on customer and user experience.
- http://www.goodexperience.com/

Florian N. Egger
- Researcher at the University of Eindhoven, Netherlands, in human-computer interaction. Offers consulting in user experience and trust, including aspects of e-commerce system design.
- http://www.ecommuse.com/

Center for Usability Research and Engineering
- Offers services and research in the field of usability engineering and user interface design in Vienna Austria.
- http://www.cure.at/

December Communication Inc.
- Web based communications company. Offers publication, presentations and consulting. Includes Computer-Mediated Communication Magazine (CMM) archives and resources.
- http://www.december.com/

WordFixers
- Offers service for designing online-help system, user documentation and translation. Located in Oslo, Norway.
- http://www.wordfixers.no/

Adaptive Path
- A User Experience design and consulting firm that unites theory and practice to advance the art of user experience design while helping clients make better business decisions. Located in California, USA.
- http://adaptivepath.com/

Nelson Usability Associates
- Provides consulting, research, and training in usability evaluation and interaction design. Located in Ohio, USA.
- http://www.nelsonusability.com/

Miramontes Computing
- Specialized in user-centered design, prototyping, support of the development process, and iterative test and refine of the final product. Includes articles by Jim Miller. Located in California, USA.
- http://www.miramontes.com

IdeasMerchant.com Ltd
- Specializes in site and user interface development, web consulting, and training.
- http://www.ideasmerchant.com

Userface Ltd
- User interface design and usability evaluation consultancy. Located in London, United Kingdom.
- http://www.userface.net

Swim Interaction Design Studio LLC
- Specialists in designing usable, useful and aesthetic interfaces for interactive products, ranging from software applications to handheld devices and medical equipment. Located in California, USA.
- http://www.swimstudio.com

Metamedia
- Provides user-oriented product and interface design services for custom software and embedded systems. Located in Tennessee, USA.
- http://www.xo4.com

Open Interface
- Offers services concerning accessibility and usability. Provides web development and training. Located in Ireland
- http://www.openinterface.ie

Hypercerulean Inc.
- Specializes in applying human factors analysis to usability engineering, testing, and interface design. Located in Washington.
- http://www.hypercerulean.com/

Ovo Studios
- Offers fixed and portable usability labs and logging software. Located in Illinois, USA.
- http://www.ovostudios.com

Syntagm
- User-centered design and development services, including object-oriented design and UML, usability evaluation and training. Located in Oxford, UK.
- http://www.syntagm.co.uk

AGConsult
- Specialized in user-friendly Internet interface. Includes online articles. Located in Belgium, website also in Dutch.
- http://www.agconsult.be

Direct Perception LLC
- Specializes in customer-centered product and service innovation. Includes links.
- http://www.directperception.com

NewOpp.ca Inc.
- A customer driven, products, process and innovation solutions provider. Based in Ontario, Canada.
- http://www.newopp.ca/

U-C Webs
- Internet effectiveness consultancy offers a range of services including web site evaluations and search engine optimization. Located in Ontario, Canada.
- http://www.u-cwebs.com/

Change Sciences
- Provides research, workshops, and consulting for improving the user experience of web sites and interactive applications. Located in New York, USA.
- http://www.changesciences.com/

The Usability Company
- Specialists in website, wireless, Intranet, digital interactive TV and software usability testing. Includes a glossary and links. Located in the United Kingdom.
- http://www.theusabilitycompany.com

Human Interfaces, Inc
- Usability consulting for web, software and hardware products. Background in Human Factors. Located in Texas, USA.
- http://www.humaninterfaces.net

Ideactif
- Offers consulting services to provide user-centred design, i.e. a combination of usability, information architecture, communications, marketing and design. Located in Canada. Main site in French.
- http://www.ideactif.com/en/

SalemSystems
- Usability testing, customer research, and product design services. Located in Washington, USA.
- http://www.salemsystems.net

Datapanik
- Provides user interface design, user centered design, and usability services for software and hardware developers. Located in Canada.
- http://www.datapanik.com/

Classic System Solutions
- A software development and professional services organization with expertise in graphical user interface (GUI) design and usability. Located in California, USA.
- http://www.classicsys.com

Genesis
- Offers usability evaluations, user-centered front-ends, software product design, and training. Located in India.
- http://www.genesishci.com

Fission Interactive
- A team of designers, programmers and usability specialists from Nortel Networks' former human factors group offer web design and usability evaluations. Located in Canada.
- http://fissioninteractive.com

Usability Architects, Inc.
- A usability consulting and contracting firm specializing in designing the user experience with user-centered methodologies.
- http://www.usability-architects.com/

EyeTracking
- Eye tracking technology to test users' responses to websites and other promotional material. Located in California, USA.
- http://www.eyetracking.com

Look and Feel Australia
- Offers user experience design plus usability and product strategy consulting. Also other services concerning interactive products.
- http://www.lookandfeel.com.au

Interpix Design Inc.
- Consulting firm with focus on simplicity and usability. Located in Canada.
- http://www.interpixdesign.com

Rocket Communications, Inc.
- Consultants providing information architecture, visual interface design, icons, and usability testing. Located in California and Hawaii, USA.
- http://www.rocketcom.com

Busse Design
- Experts in user interface design for applications and other web-based products. Located in California, USA.
- http://www.bussedesign.com/

Mental Models
- Employs a user-centered approach to provide User Interaction consulting, rapid prototyping, presentation and graphic design. Focus on enterprise applications. Located in California, USA.
- http://www.mentalmodels.com/frame.jsp/pages/home

Interaction Design
- Offers Web design and usability testing services.
- http://www.user.com

Filament Group
- Designs software and websites, provides market analysis and training, and works with rich media and wireless technologies. Located in Massachusetts, USA.
- http://www.filamentgroup.com

Diamond Bullet Design
- Web site design, user interface design, plus accessibility and usability evaluation services. Located in Michigan, USA.
- http://www.diamondbullet.com

Sterling Creations
- Technology for persons with special needs and access for everyone.
- http://www.sterlingcreations.ca/

Namahn
- Consulting firm specializing in customer-focused information design and interaction design of media, products and tools. Located in Belgium.
- http://www.namahn.com/

GUI Designers
- Usability Consultancy committed to designing and evaluating successful and effective Windows Applications and Web Sites. Offering the full range of Usability Services. Located in the United Kingdom.
- http://gui-designers.co.uk/

User Interface Design GmbH
- Specializes in usability engineering, graphic design and software engineering, Located in Germany (Munich, Stuttgart, Mannheim).
- http://www.uidesign.de/

User Interface Engineering
- Provides usability consulting, research, training and conferences. Located in Massachusetts, United States.
- http://www.uie.com

Section 508 Accessibility
- Consulting services including 508 compliance audits, accessibility redesign and retrofit, testing and training. Located in California.
- http://508.intetics.com

Kraka Inc.
- Offering consulting services in most aspects of interaction design. Located in California, USA.
- http://www.kraka.com/

Usability Consultancy
- Strategic Web design consultancy which uses user centred design and market research techniques. Located in the United Kingdom.
- http://www.u-consulting.co.uk/

Human Factors International, Inc.
- Ensuring usability and systems consistency through software ergonomics, human factors science and design considerations. Located in Iowa, USA.
- http://www.humanfactors.com/

Usability Systems, Inc.
- Design of custom usability testing environments, including stationary labs and portable labs. Located Georgia, USA.
- http://www.usabilitysystems.com

Knabe Design
- Information architecture, interaction design, technical writing, user centered design, and usability evaluation. Located in Pennsylvania, USA.
- http://www.knabedesign.com

The Usability Group
- Specializing in customer research and analysis of technology products and services. Jeff Rubin and Dave Rinehart manage offices in New Jersey and Atlanta, USA.
- http://www.usability.com

Sprezzatura Systems, Inc.
- Software design, programming, documentation, and review. White papers and other collaterals. Web site design and writing. Located in California, USA.
- http://www.sprez.com/

HumanCentric Technologies, Inc.
- Human factors testing and consulting firm with expertise in Web design, and consumer electronics. Located in North Carolina, USA.
- http://humancentrictech.com

Milobox, Inc.
- Helps clients create, renew and strengthen their user interaction to enhance the user experience for software and websites. Includes articles and other resources.
- http://www.milobox.com

Corsair
- Specializes in customer experience, visual design, information architecture, and strategy. Located in New York, USA.
- http://www.corsairstudio.com

The Hiser Group
- Committed to liberating technology from the technologists and letting people play with it instead. Focus on usability and accessibility of interface design. Located in Australia.
- http://www.hiser.com.au/

TheUEgroup
- Experienced consultants specializing in the area of user interface design and usability. Located in California, USA.
- http://www.theuegroup.com/

Spox Design
- Usability testing service. Offering independent review and analysis, and testing of websites using actual users.
- http://www.spoxdesign.com

Lextant
- Provides user experience research, user-centered interactive design and usability evaluation. Offices in Ohio and Colorado, USA.
- http://www.lextant.com

Ergosoft Laboratories
- Bases information architecture and interface design on user data and continuous usability testing. Located in Texas, USA.
- http://www.ergolabs.com/

MauroNewMedia
- Consulting services concerning User Interface Design and Usability Engineering. Located in New York, USA.
- http://www.mauronewmedia.com

Userlab, Inc.
- Consulting in website usability, training and testing.
- http://www.userlab.com

European Usability Support Centres
- A network of technology centres across Europe to help companies enhance the usability of their products and systems.
- http://www.lboro.ac.uk/research/husat/eusc/

McGee, Patrick W.
- User interface designer and illustrator for online and offline media in Texas, USA.
- http://www.pmcgee.net

Interface Guru
- Tests and makes recommendations on how to improve commercial websites. Located in Tucson, Arizona, USA.
- http://www.interfaceguru.com

Flow Interactive
- Offers consulting services to research, design, and evaluate interactive products. They will either design a solution for you, or help you to design the most user friendly one yourselves. Located in the UK.
- http://www.flow-interactive.com/

Hibbitts, Paul D.
- Provides user interface design services, including usability evaluations and education. Located in Canada.
- http://www.paulhibbitts.com

Cooper Interaction Design
- Offers a range of goal-directed services that can be used to create and improve interactive solutions from California, USA.
- http://www.cooper.com

Hastings Research
- Internet and interface development. specialise in HCI, usability, architecture, systems integration and e-business. Offer a number of white papers. Located in California, USA.
- http://www.hastingsresearch.com/

True Matter, LLC
- Interactive application development and design consultancy focused on crafting effective Web experiences. Located in South Carolina, USA.
- http://www.truematter.com

Creative Good
- Offers to improve customer experience. Located in New York, USA.
- http://www.creativegood.com

Icon Medialab
- Offers a wide range of services with a focus on the user experience in a wide range of web-based applications. This internationally oriented company has locations in Europe and North America.
- http://www.iconmedialab.com/

LukeW Interface Designs
- Specializes in the visual, interface, and interaction design of web-based applications and identities. Located in Illinois, USA.
- http://www.lukew.com/

Frontend
- Frontend provides user-centred interface solutions for online developments and software applications. Includes the Usability Infocentre and User News newsletter. Located in Ireland.
- http://www.frontend.com

Beta Research, Inc.
- Consulting and research in human factors, ergonomics, usability and safety in product and system design from California, USA.
- http://www.beta-research.com/

Adducive
- Software user interface design and rapid production services including prototypes for telephone, handheld, and desktop systems. The website describes services offered and tips for effective user interface development. Located in California, USA.
- http://www.adducive.com/

Ariel Performance Centered Systems, Inc.
- A management consulting and software development company that has expertise with all forms of Electronic Performance Support Systems (EPSS). Located in Ohio, USA.
- http://www.arielpcs.com/

Humansystems Inc.
- Specializes in Human Factors and Applied Ergonomics. A consultant company involved in web site analysis, HCI, task analysis and modeling. Located in Canada.
- http://www.humansys.com

GUIguy
- User interface design and usability consulting for Windows applications and web sites, for business productivity.
- http://www.guiguy.com/

Constantine & Lockwood, Ltd.
- Supports usage-centered design for more usable software-based products through training, design, evaluation, and consulting services. Located in Massachusetts, USA.
- http://www.foruse.com/

British HCI Group Consultancy Listing
- Listing of UK academic and commercial consultants in Human-Computer Interaction, providing initial contact information for prospective clients seeking experts within this field.
- http://www.visualize.uk.com/bcshci/conslist/

Interface Consult
- Offers web design services and features usability testing facilities. Located in Austria.
- http://www.usability.at/e/

Meleniak
- Offering usability evaluation, accessibility advice, and web design. Located in the United Kingdom.
- http://www.meleniak.com/

Corporate Solutions Consulting
- Provides usability services including web site evaluations and design. Located in the UK.
- http://www.consult-me.co.uk