About AT-node

AT-node for Access is a public, searchable collection of research on the use of computer access interfaces by people with disabilities. The name comes from the acronym for Assistive Technology Network of Outcomes, Data, and Evidence.

The Access database focuses on data from access interfaces used to control a computer or augmentative communication system. It includes text entry rate data from studies published since 1986.

AT-node arose out of a systematic review on access interfaces for people with disabilities, written by Heidi Horstmann Koester and Sajay Arthanat. The goal is to make the hard-won data from the systematic review available to others, and to provide a way to continually maintain a current database of valid data on access interfaces.


AT-node serves as an evidence-based tool for AT service providers and end users to facilitate informed selection of text entry interfaces. The data can be explored from multiple standpoints to create benchmarks for text entry based on the type of interface, individual diagnosis, and body site being considered for interface activation. The information can inform interface selection, goal setting, and optimizing training for selected interfaces.

Researchers and students can use AT-node to identify relevant publications and data on computer access, saving significant time and effort. It provides an efficient way of learning what has already been done and what gaps remain in the field.


photo of Heidi Koester

Heidi Koester

Heidi Koester, PhD is the President of Koester Performance Research (KPR). She has also been a rehabilitation engineer and research fellow at the University of Michigan. KPR designs and builds software tools to enhance computer access and support data-driven decision-making.

photo of Sajay Arthanat

Sajay Arthanat

Sajay Arthanat, PhD, OTR/L, ATP is an Associate Professor in the Department of Occupational Therapy at the University of New Hampshire. He teaches the core assistive technology course for graduate students at the UNH occupational therapy program. Dr. Arthanat has conducted research on assistive technology outcomes measurement for the past 15 years and has published peer-reviewed articles in the area of computer access.


We greatly appreciate the contributions of Jacob Shapiro (design) and Aki Ota (development), while both were undergraduate students at the University of Michigan. We're also grateful for those who've taken the time to give us their feedback on AT-node as it has evolved.

Are you a researcher who would like to add your research to the database?

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