Observer-Reported Communication Ability Measure (ORCA)

The ORCA measure is a survey
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The Observer-Reported Communication Ability (ORCA) measure assesses the communication ability of individuals with neurodevelopmental disorders that significantly impact verbal speech.

The intended use of the ORCA measure is to assess an individual’s baseline communication ability level and subsequent changes in communication ability over time in a research study. The questionnaire is designed to be completed by the primary caregiver who is most familiar with the individual and the ways they communicate.

ORCA is a validated, 84-item, observer-reported measure of communication ability, available in 11 languages.

Scores: Overall

Formats: Print/PDF, Web, App

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The ORCA measure captures overall communication ability through observable behaviors within expressive, receptive, and pragmatic types of communication. The measure consists of 84 total questions with 70 behavioral items within 22 concepts/functions (e.g., refuse object, make choices) that cover expressive, receptive and pragmatic areas of communication, alongside a set of 14 descriptive items that capture important information about the individual’s unique ways of communicating (e.g. modalities the individual uses, their current vocabulary, and language complexity). The descriptive items follow skip logic, so it is possible not every caregiver will complete every question.

The ORCA measure was purposely designed to be modality agnostic – meaning that a child could score high or low on the ORCA regardless of whether they use gestures/signs, vocalizations/sounds, words, and/or assistive technology to communicate. The ORCA Measure is available in English and has language translations in Arabic (Israel), Dutch (Netherlands), English (Australia), English (Canada), English (UK), French (Canadian), French (France), German (Germany), Hebrew (Israel), Italian, Polish (Poland), Portuguese (Portugal), and Russian (Russian Federation), Spanish (Spain), Spanish (USA), Turkish (Turkey).

The ORCA Measure was developed using rigorous qualitative and quantitative methods and was originally designed to assess the communication ability of an individual with Angelman syndrome (AS) from the perspective of their caregiver. The target population was any individual with AS (of any genotype) aged 2 years old or older (including adults with AS). The content included in the ORCA measure was informed by interviews with parents of individuals with AS and by communication specialists (e.g., speech-language pathologists). Specialists treated both individuals with AS and individuals with other developmental communication disorders.

Although the ORCA measure has not been currently validated in populations other than AS, it may be applicable to other similar neurodevelopmental disease groups. Ideally, these should be populations where most individuals are nonverbal or communicate primarily through modalities other than spoken words. Please note, if you would like to use the ORCA measure with populations other than Angelman syndrome, then the ORCA measure would be considered an exploratory measure and could not serve as the primary outcome measure until additional validity evidence is gathered in your population and context of use. Please click here for more information and guidance.

Download these ORCA resources for more information:

The ORCA Measure is copyright Duke University. Pattern Health is the exclusive authorized distributor of the ORCA Measure.

The ORCA measure was developed by members of the Duke Center for Health Measurement who have expertise in the design and evaluation of measures. The research team also included speech language pathologists who have expertise in assessing communication ability in a variety of populations with communication deficits.