Welcome to A-ONe

 The ADL-focused Occupation-based Neurobehavioral Evaluation

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the program


Guðrún Árnadóttir was Keynote speaker at the 52nd annual conference of the Japanese Association of Occupational Therapists.

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New PhD Dissertation

Yasuhiro, H. recently defended his Doctoral dissertation in Osaka, Japan.

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2019 AOTA Conference

Jaewon Kang presented her research at the 2019 AOTA Conference in New Orleans.

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The ADL-focused Occupation-based Neurobehavioral Evaluation


The A-ONE, a standardized criterion-based instrument, is used by occupational therapists to assess persons with neurological disorders affecting activities of daily living (ADL).


The A-ONE enables occupational therapists to determine the level of assistance needed for performing ADLs and simultaneously determine the underlying reason for the lack of independence. In particular it aids in determining the impact of neurobehavioral impairments on ADL task performance in natural contexts. That is it provides simultaneously information on level of ADL performance and impairments causing limitations in independence.


When using the A-ONE, determination of the type of impairment(s) impacting on the ADL performance resulting in occupational performance errors is based on hypothesis testing through specific clinical reasoning procedures.


The A-ONE consists of two ordinal rating scales, a Functional Independence (FI) scale focusing on ADL performance and a Neurobehavioral (NB) impairment scale focusing on type of impairment and severity of impact on ADL.


Five day training courses for practice in clinical reasoning are necessary for reliable administration and scoring of the evaluation.


The A-ONE abbreviation

The A-ONE is an abbreviation for an evaluation instrument originally named The Árnadóttir OT-ADL Neurobehavioral Evaluation. OT stands for occupational therapy and ADL for activities of daily living. More recently it has been referred to as The ADL-focused Occupation-based Neurobehavioral Evaluation.


A-ONE is about occupational performance errors reflecting CNS functioning that cannot be observed directly