BDAE-3: What It Measures
Boston Diagnostic Aphasia Examination, Third Edition
Quick answer
The BDAE-3 measures the components of language affected by aphasia — conversational and expository speech, auditory comprehension, oral expression, reading, and writing — and profiles them to support diagnosis of aphasia type. It is more descriptive and linguistically detailed than the WAB-R and includes the Boston Naming Test as a companion measure.
The BDAE-3 is the more descriptive cousin of the WAB-R. Where the WAB-R funnels a patient toward a single classification and a quotient, the BDAE-3 builds a profile of speech characteristics — melodic line, phrase length, articulatory agility, grammatical form, paraphasia, word finding, repetition, and auditory comprehension — that supports finer clinical reasoning.
BDAE-3 at a glance
- Full name
- Boston Diagnostic Aphasia Examination, Third Edition
- Publisher
- Pearson
- Domain
- Aphasia & Cognition
- Age range
- Adults
- Administration time
- Short form about 30–45 minutes; standard form 1–2 hours or more
- Format
- Comprehensive adult aphasia examination with short, standard, and extended versions
- Score types
- Subtest percentiles, Severity rating scale (0–5), Rating Scale Profile of Speech Characteristics
What the BDAE-3 measures
- Conversational and expository speech, including the Cookie Theft picture description
- Auditory comprehension of words, commands, and complex ideational material
- Oral expression: repetition, automatized sequences, recitation, naming
- Reading: word and sentence comprehension, oral reading
- Writing: mechanics, written naming, narrative writing to a picture
Subtests and sections
- Conversational & Expository Speech
- Free conversation and picture description used for the speech characteristics profile.
- Auditory Comprehension
- Word discrimination, body-part identification, commands, and complex ideational material.
- Oral Expression
- Automatized sequences, repetition, responsive naming, and confrontation naming.
- Reading
- Basic symbol recognition through sentence and paragraph comprehension.
- Writing
- Mechanics, dictation, and narrative writing.
- Boston Naming Test (BNT)
- 60 line drawings of increasing rarity used to quantify confrontation naming and word retrieval.
Rating Scale Profile of Speech Characteristics
The BDAE-3's signature feature is a set of rating scales applied to a connected-speech sample: melodic line, phrase length, articulatory agility, grammatical form, paraphasia in running speech, word finding relative to fluency, and auditory comprehension. Plotting these produces a visual profile that separates, for example, a patient with agrammatic but well-articulated output from one with effortful, apraxic output — a distinction that changes the treatment plan entirely.
This is why the BDAE-3 survives alongside faster tools: no quotient tells you whether to target grammatical form or articulatory programming.
BDAE-3 or WAB-R?
Choose the WAB-R when you need a defensible severity score, a syndrome classification, and a repeatable outcome metric — typical in inpatient rehab and payer documentation. Choose the BDAE-3 when the question is 'what exactly is breaking down and how do I treat it,' or when the connected-speech profile will drive target selection. Many programs administer the WAB-R for classification and severity, then add the Boston Naming Test for anomia depth.
Strengths
- Rich qualitative profile that guides individualized treatment planning.
- Cookie Theft picture is a standard connected-speech sample used across research and clinics.
- Short form makes acute-care use practical.
- Companion BNT gives a well-normed anomia measure.
Limitations
- Long and cognitively demanding in the standard form.
- Scoring and interpretation require more clinical judgment than the WAB-R's quotient.
- Less commonly used for outcome tracking because there is no single summary score analogous to the AQ.
- Norms are older relative to some contemporary measures.
When clinicians use it
- Detailed diagnostic profiling when treatment planning needs more than a syndrome label.
- Documenting connected-speech characteristics before and after intervention.
- Research protocols where linguistic granularity matters.
- Pairing with functional and participation measures for goal writing.
What the Praxis 5331 asks about the BDAE-3
- Know the BDAE-3 as the descriptive/profiling alternative to the WAB-R's classification-and-quotient approach.
- Recognize the Cookie Theft picture and what a connected-speech sample reveals about fluency and paraphasia.
- Understand the Boston Naming Test as the standard confrontation naming measure for anomia.
Practice assessment questions with rationales
Praxis Path pairs this reference material with scenario questions, spaced-repetition flashcards, and a timed 132-question mock exam.
FAQ
What does the BDAE-3 measure?
The language components disrupted by aphasia: conversational speech, auditory comprehension, oral expression, reading, and writing, plus a qualitative profile of speech characteristics.
What is the difference between the BDAE-3 and the WAB-R?
The WAB-R produces a summary Aphasia Quotient and a syndrome classification; the BDAE-3 produces a richer descriptive profile that better guides individualized treatment targets.
Is the Boston Naming Test part of the BDAE-3?
Yes, the BNT is published as a companion measure and is commonly administered with the BDAE-3 to quantify confrontation naming.
What is the Cookie Theft picture?
A standardized picture-description stimulus in the BDAE used to elicit a connected-speech sample for analysis of fluency, grammar, and paraphasia.