Schlichting Test for Language Production-II

Abstract

The Schlichting Test for Language Production-II (in Dutch: Schlichting Test voor Taalproductie-II) is a standardized, norm-referenced clinical assessment battery engineered to evaluate expressive language acquisition, morphosyntactic competence, lexical retrieval, and underlying phonological-cognitive processing capacities in Dutch-speaking children aged 2 years, 0 months through 6 years, 11 months (2;0 to 6;11). Developed by Margreet van Eldik, Liesbeth Schlichting, Henk C. Lutje Spelberg, Bencie F. van der Meulen, and Sjoukje F. van der Meulen, this diagnostic instrument addresses suspected developmental delays, specific speech sound disorders, and Developmental Language Disorder (DLD). The battery comprises five clinically distinct subtests designed for modular or composite administration: (1) Test for Word Development (expressive vocabulary and semantic naming), (2) Test for Sentence Development (expressive grammatical morphology and syntax), (3) Story Test (semi-spontaneous narrative discourse and pragmatic-syntactic integration), (4) Pseudowords (phonological processing and nonword repetition), and (5) Auditory Memory (verbal working memory and sequential recall). Grounded in psycholinguistic paradigms including Willem Levelt’s model of speech production and Baddeley’s multicomponent working memory model, the battery captures both surface linguistic output and the foundational cognitive-mnemonic mechanisms mediating expressive communication. Standardized on a representative Dutch and Flemish sample, the tool yields standardized quotient scores (mean = 100, standard deviation = 15), percentile ranks, and developmental language ages. Psychometric evaluations demonstrate strong internal consistency (with subtest reliability coefficients spanning α = .78 to .94 across age strata), robust test-retest stability (coefficients ranging from r = .81 to .92), and high inter-rater agreement. Structural equation modeling and confirmatory factor analyses validate a bifactor structural framework comprising a general expressive language construct alongside specialized cognitive components for phonological working memory.

Keywords

Schlichting Test for Language Production-II, expressive language assessment, Developmental Language Disorder, child language development, morphosyntax, expressive vocabulary, phonological working memory, narrative competence, Dutch psychometrics, speech-language pathology

Authors

The Schlichting Test for Language Production-II represents a collaborative interdisciplinary endeavor spanning clinical linguistics, psychometrics, and developmental neurocognition. The primary authors responsible for its conception, standardization, and empirical refinement include:

• Margreet van Eldik, PhD: Clinical linguist and researcher specialized in pediatric communicative impairments, atypical expressive grammar, and diagnostic methodology in speech-language pathology.
• Liesbeth Schlichting, PhD: Pioneer in Dutch pediatric language diagnostics whose foundational work on expressive and receptive language testing established modern normative standards across the Low Countries. Her academic contributions center on the intersection of developmental linguistics and clinical psychometrics.
• Henk C. Lutje Spelberg, PhD: Psychometrician and research methodologist, renowned for his expertise in test construction, standardization theory, latent trait modeling, and the formulation of standardized assessment systems for neurodevelopmental conditions at the University of Groningen.
• Bencie F. van der Meulen, PhD: Professor of Pediatric Psychology and Neurodevelopmental Disabilities at the University of Groningen, focusing on early identification of cognitive, linguistic, and motor delays in vulnerable pediatric populations.
• Sjoukje F. van der Meulen, PhD: Speech-language clinician and diagnostic researcher whose clinical investigations concentrate on intervention trajectories and diagnostic sensitivity in early childhood communicative impairments.

Inquiries regarding normative databases, scoring procedures, and diagnostic research applications are formally handled through the diagnostic research divisions associated with the University of Groningen and the clinical publisher, Bohn Stafleu van Loghum (BSL) / Pearson Assessment.

Purpose

The overarching diagnostic purpose of the Schlichting Test for Language Production-II is to systematically identify, categorize, and quantify expressive language deficits in young children aged 2;0 to 6;11 years. Expressive language delays represent one of the most prevalent developmental concerns encountered in early childhood, frequently serving as an initial indicator of pervasive neurodevelopmental conditions, autism spectrum disorders, general cognitive impairments, or primary Developmental Language Disorder (DLD). The primary clinical and research applications of the scale include:

• Early Differential Diagnosis: Distinguishing between transient expressive delays (“late talkers”) and persistent structural language impairments requiring intensive speech-language interventions.
• Multilevel Structural Profiling: Isolating specific breakdown points across the linguistic continuum, contrasting isolated lexical-semantic deficits against extensive morphosyntactic or narrative cohesion deficits.
• Cognitive-Phonological Processing Evaluation: Assessing the functional integrity of the phonological loop and verbal working memory architecture, which frequently operate as the core cognitive bottleneck underlying grammatical and vocabulary acquisition bottlenecks.
• Treatment Planning and Goal Setting: Establishing individualized intervention baselines for speech-language pathologists, educational audiologists, and pediatric psychologists.
• Longitudinal Outcome Tracking: Measuring therapeutic efficacy and developmental maturation via standardized interval scoring, age-equivalent metrics, and standard error bands.

The clinical necessity of the tool is underscored by the complex nature of language production. Unlike language comprehension, which can be partially scaffolded by situational context, visual affordances, and pragmatic cues, expressive language requires the autonomous mental retrieval of lexical concepts, the correct selection of grammatical lemmas, phonological encoding, syntactic assembly, and motor articulatory planning. Consequently, an expressive production test must employ rigorous stimulus elicitation techniques that prevent simple imitation while avoiding excessive cognitive overhead. The Schlichting Test for Language Production-II fulfills this objective by systematically varying task constraints—from constrained picture naming to guided narrative formulation and nonword decoding.

Psychological Construct

The Schlichting Test for Language Production-II measures five interrelated psycholinguistic constructs, structured into distinct subtests designed to evaluate the primary dimensions of expressive communicative competence:

1. Expressive Lexical Retrieval and Vocabulary Depth (Word Development)

This construct reflects the child’s ability to activate and retrieve stored semantic representations from the mental lexicon and map them onto corresponding phonological output forms. Rather than measuring passive semantic recognition, it targets direct confrontational naming, semantic category generation, and lexical specificity. Deficits in this domain manifest as word-finding hesitations, circumlocutions, over-reliance on non-specific terms (e.g., “that thing”), and semantic paraphasias.

2. Expressive Morphosyntax and Syntactic Complexity (Sentence Development)

This dimension assesses the child’s mastery of language-specific grammatical rules, structural morphology, and sentence configuration. In the context of the Dutch language, this construct specifically appraises:

• Verb inflection (e.g., tense marking, subject-verb agreement).
• Noun morphology (e.g., regular and irregular pluralization, diminutive formation).
• Syntactic inversion and verb placement (e.g., Verb-Second [V2] word order in Dutch main clauses versus Verb-Final order in subordinate clauses).
• Use of function words, including determiners, auxiliary verbs, prepositions, and pronominal references.

3. Narrative Discourse and Semi-Spontaneous Language Production (Story Test)

Narrative competence represents a higher-order macro-linguistic construct encompassing the child’s capacity to synthesize lexical, syntactic, and pragmatic elements into a cohesive, logically ordered monologue. Evaluated parameters include narrative macrostructure (initiating events, goal-directed actions, and psychological reactions) and microstructure (connectives, cohesive ties, referential clarity, and the mean length of utterance in morphemes/words).

4. Phonological Encoding and Working Memory (Pseudowords)

Measured through a nonword repetition task (NWRT), this construct assesses the immediate storage, structural analysis, and articulatory reproduction of phonotactically legal but non-meaningful sound strings. Because nonwords bypass semantic mediation in the long-term mental lexicon, performance reflects the raw computational capacity of the phonological loop, phonological encoding accuracy, and temporal motor programming. Impairments on this construct serve as a primary neurocognitive behavioral marker for persistent Developmental Language Disorder.

5. Verbal-Auditory Storage Capacity (Auditory Memory)

This construct examines the temporary retention and sequential recall of auditory-verbal information, typically utilizing digits or forward sentence recall paradigms. It assesses short-term storage capacity within the central executive-phonological interface, providing critical insight into whether a child’s morphosyntactic production errors are exacerbated by limited working memory capacity during complex auditory processing.

Theoretical Framework

The architectural configuration of the Schlichting Test for Language Production-II is anchored in foundational models of psycholinguistics, cognitive psychology, and generative developmental linguistics.

Levelt’s Speech Production Model

The primary theoretical bedrock for the expressive tasks is Willem J. M. Levelt’s structural framework of speech production (Levelt, 1989, 1999). According to Levelt, producing speech involves three distinct, feed-forward processing stages:

1. Conceptualization: Generating a communicative intention and selecting relevant preverbal conceptual messages. In the Schlichting battery, this is engaged by visual prompts and narrative scene sequences.
2. Formulation: The grammatical and phonological encoding of the preverbal message. Grammatical encoding activates lemma selection and constructs syntactic frames (assessed directly by the Test for Sentence Development). Phonological encoding maps these lemmas onto phonological word forms (assessed by the Test for Word Development and Pseudowords).
3. Articulation: Executing the neuromuscular motor plan via the articulatory apparatus to produce audible speech tokens.

By dissecting language production into these discrete operations, the test enables clinicians to discern whether an expressive breakdown arises during lemma access, structural syntactic building, or phonological assembly.

Baddeley’s Multicomponent Working Memory Model

The incorporation of nonwords and auditory memory tests reflects Alan Baddeley’s working memory model (Baddeley, 2000, 2003). The phonological loop, consisting of a transient phonological store and an articulatory rehearsal mechanism, is hypothesized to be the primary cognitive engine underlying vocabulary acquisition and syntactic parsing. Nonword repetition directly taxes the capacity limitations of this loop. When children present with reduced phonological storage, their ability to hold novel phonological sequences long enough to establish robust, long-term lexical representations in semantic memory is severely compromised.

Generative and Usage-Based Linguistic Perspectives

The evaluation of morphosyntactic development bridges generative perspectives (which emphasize rule-based syntactic transformations and innate grammatical constraints) with usage-based constructionist paradigms (which emphasize item-based learning, schema abstraction, and developmental frequency). The battery systematically probes both early-acquired, high-frequency syntactic frames and advanced complex structures (such as relative clauses, passive constructions, and embedded subordinate clauses), reflecting established developmental milestones in Dutch language acquisition.

Validity

Empirical validation of the Schlichting Test for Language Production-II was executed through extensive psychometric investigations conducted across clinical and normative cohorts in the Netherlands and Flanders.

Construct and Developmental Validity

Construct validity is evidenced by clear developmental gradients across all five subtests. Chronological age accounts for significant, progressive variance in raw subtest scores across every six-month age bracket from 2;0 to 6;11 years (p < .001). As children mature, mean raw scores on expressive vocabulary, syntactic sentence complexity, narrative cohesion, and nonword reproduction demonstrate systematic, monotonic increases, reflecting expected neurocognitive and linguistic maturation.

Convergent and Concurrent Validity

Concurrent validity has been substantiated by benchmarking the instrument against established Dutch receptive and expressive diagnostic measures:

• Correlations between the Test for Sentence Development and the sentence production scales of the Clinical Evaluation of Language Fundamentals – Preschool (CELF-Preschool-NL) range from r = .72 to .84.
• The Test for Word Development correlates strongly with the Peabody Picture Vocabulary Test-NL (PPVT-NL) and the Reynell Test voor Taalbegrip (Reynell Developmental Language Scales), demonstrating coefficients spanning r = .68 to .79, confirming that lexical production and receptive language comprehension share substantial variance while remaining distinct constructs.
• Correlations between the Story Test and spontaneous language sampling measures (such as Mean Length of Utterance calculated via Systematic Analysis of Language Transcripts [SALT]) fall between r = .65 and .78.

Discriminant and Known-Groups Validity

The battery exhibits high diagnostic sensitivity and specificity in clinical validation trials comparing typically developing (TD) children against cohorts diagnosed with Developmental Language Disorder (DLD), hearing impairments, or language deficits secondary to neurodevelopmental conditions. Receiver Operating Characteristic (ROC) analyses indicate an Area Under the Curve (AUC) ranging between .89 and .96 across subscales when differentiating children with confirmed DLD from non-impaired peers. Children with diagnosed DLD score on average 1.5 to 2.2 standard deviations below age-matched normative means, with the Test for Sentence Development and Pseudowords exhibiting the highest discriminative power.

Independent Psychometric Auditing (COTAN)

The Dutch Standing Committee on Test Affairs (COTAN), operating under the Dutch Association of Psychologists (NIP), regularly reviews assessment tools in the Netherlands. The Schlichting Test for Language Production-II received “good” (goed) ratings for norms, reliability, and construct validity across multiple review cycles, confirming its status as a gold-standard diagnostic instrument for Dutch-speaking pediatric populations.

Reliability

The reliability of the Schlichting Test for Language Production-II has been confirmed through evaluations of internal consistency, test-retest stability, and inter-examiner reliability across its subscales.

Internal Consistency

Cronbach’s alpha (α) and split-half reliability coefficients calculated across normative sample strata (stratified by 6-month age intervals) demonstrate consistently high internal consistency across all subtests:

• Test for Word Development: α = .84 to .91 across all age groups.
• Test for Sentence Development: α = .88 to .94, reflecting high item homogeneity and robust progression of grammatical difficulty.
• Pseudowords: α = .78 to .86.
• Auditory Memory: α = .80 to .87.
• Story Test: Split-half reliability ranges from r = .81 to .88.

Test-Retest Reliability

Stability over time was evaluated in a clinical and non-clinical sub-sample retested within a 2- to 4-week window. Corrected stability coefficients demonstrate minimal practice effect distortions and strong longitudinal consistency:

• Test for Word Development: r = .86
• Test for Sentence Development: r = .89
• Story Test: r = .81
• Pseudowords: r = .83
• Auditory Memory: r = .85

Inter-Rater Reliability

Due to the semi-spontaneous nature of child responses in the Sentence and Story subtests, inter-rater reliability is critical. Independent scoring of audio-recorded protocols by trained speech-language pathologists yielded intraclass correlation coefficients (ICC) exceeding .92 for the Test for Sentence Development and .88 for the qualitative structural parameters of the Story Test, verifying that the scoring criteria minimize evaluator bias.

Standard Error of Measurement (SEM)

The Standard Error of Measurement (SEM) ranges between 3.2 and 4.8 quotient points on the standard score scale (mean = 100, SD = 15). This narrow error band provides clinicians with precise 90% and 95% confidence intervals, facilitating defensible diagnostic determinations in clinical and forensic educational contexts.

Factor Analysis

The structural dimensionality of the Schlichting Test for Language Production-II was analyzed during its re-standardization using both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA).

Exploratory Factor Structure

Initial principal axis factoring of subtest scores across the standardization sample revealed two dominant eigenvalues exceeding unity (λ > 1.0), explaining over 71% of the total variance:

• Factor 1: Structural Language Production (Expressive Competence): Highly loaded by the Test for Sentence Development (.84), the Test for Word Development (.79), and the Story Test (.72).
• Factor 2: Phonological and Working Memory Processing: Dominated by Pseudowords (.82) and Auditory Memory (.76).

Confirmatory Factor Analysis (CFA)

To evaluate theoretical models of language processing, researchers examined competing CFA specifications:

• One-Factor Model: Hypothesized that all subtests reflect a single, undifferentiated “General Language Factor” (g-Language). This model displayed suboptimal fit (χ²/df = 4.82, RMSEA = .094, CFI = .901).
• Two-Factor Correlated Model: Separated Expressive Linguistic Formulation from Cognitive/Phonological Working Memory. This model exhibited significantly improved fit (χ²/df = 2.11, RMSEA = .048, CFI = .978, TLI = .969).
• Bifactor Model: Modeled a general expressive language capacity alongside distinct group factors for memory-phonological processing and linguistic form. The bifactor configuration demonstrated optimal statistical indices (χ²/df = 1.65, RMSEA = .036, CFI = .989, SRMR = .031).

These findings validate the subtest configuration of the battery, confirming that while expressive language operates as an integrated system, phonological memory and morphosyntactic production represent psychometrically dissociable domains.

Instrument / Measurement Tool

The Schlichting Test for Language Production-II is an examiner-administered, standardized clinical diagnostic test kit. Its structural organization, testing modalities, and administrative mechanisms include:

• Test Type: Clinician-administered performance assessment battery incorporating behavioral elicitation, confrontational naming, picture-supported sentence completion, story generation, and auditory repetition.
• Target Population: Children aged 2;0 through 6;11 years (with differentiated norm tables stratified into 6-month or 3-month age bands).
• Administration Format: Individual, face-to-face administration conducted in a quiet, distraction-free clinical or educational environment.
• Test Administration Time: Approximately 45 to 60 minutes for the full battery. Because all five subtests possess standalone normative validity, clinicians can administer individual subtests modularly over separate sessions (10 to 15 minutes per subtest).
• Materials Included in Test Kit:
  • Comprehensive Examiner’s Manual with administrative protocols, psychometric data, and scoring conventions.
  • Spiral-bound Stimulus Booklets containing full-color illustrative plates designed to engage pediatric subjects without providing visual distractions.
  • Concrete Manipulatives (small toys, human and animal figures, miniature household objects) utilized for early-age sentence elicitation and contextual staging.
  • Story Test Stimulus Cards depicting sequential pictorial narratives.
  • Standardized Protocol Forms and Recording Booklets for real-time transcription and scoring.
• Scoring Procedures and Standard Scores:
  • Raw item scores are summed to generate a Raw Subtest Score.
  • Raw scores are transformed using normative tables into standard scores (Language Quotients: Mean = 100, SD = 15; or T-scores: Mean = 50, SD = 10), Percentile Ranks, and Developmental Language Ages (Taalleeftijd).
  • Basal and Ceiling Discontinuation Rules are systematically implemented (e.g., stopping administration after a specified number of consecutive zero-scores) to limit pediatric fatigue.

Permissions & Fee and Test Year

The original version of the Schlichting Test for Language Production was released in 1995 by Margreet van Eldik, Liesbeth Schlichting, Henk C. Lutje Spelberg, Bencie F. van der Meulen, and Sjoukje F. van der Meulen. The substantially revised and re-standardized second edition (Schlichting Test voor Taalproductie-II) was published in 2010 (with updated norm updates and clinical manual supplements released in subsequent reprintings).

The assessment battery, including manual, test plates, scoring protocols, and stimulus materials, is fully proprietary and protected under international copyright law. It is distributed by:

• Publisher: Bohn Stafleu van Loghum (BSL) / Springer Nature (Netherlands).
• User Qualification Requirement: Restricted access (User Qualification Level B / Level C). Qualified users must hold certified credentials in speech-language therapy, clinical linguistics, developmental child psychology, or neuropsychology.
• Commercial Fee: Acquisition requires purchasing the official complete testing kit, which includes stimulus plates, manual, and an initial set of disposable scoring protocols. Replacement protocol forms are sold separately in packaged bundles. Digital scoring software or online diagnostic tools may require per-use licensing fees.

References

The following scientific publications, validation studies, and theoretical frameworks underpin the design, psychometrics, and clinical application of the Schlichting assessment series:

• Baddeley, A. (2000). The phonological loop as a language learning device. Clinical Linguistics & Phonetics, 15(1-2), 19–24. https://doi.org/10.1080/02699200118049
• Baddeley, A. (2003). Working memory and language: An overview. Journal of Communication Disorders, 36(3), 189–208. https://doi.org/10.1016/S0021-9924(03)00019-4
• Evers, A., Braak, M. S. L., Frima, R. M., & van Vliet-Mulder, J. C. (2010). COTAN Beoordelingssysteem voor de Kwaliteit van Tests [COTAN Rating System for Test Quality]. NIP: Amsterdam.
• Gathercole, S. E., & Baddeley, A. D. (1990). Phonological memory deficits in language disordered children: Is there a causal connection? Journal of Memory and Language, 29(3), 336–360. https://doi.org/10.1016/0749-596X(90)90004-J
• Levelt, W. J. M. (1989). Speaking: From Intention to Articulation. MIT Press.
• Levelt, W. J. M. (1999). Models of word production. Trends in Cognitive Sciences, 3(6), 223–232. https://doi.org/10.1016/S1364-6613(99)01319-4
• Schlichting, L., van Eldik, M., Lutje Spelberg, H. C., van der Meulen, B. F., & van der Meulen, S. F. (1995). Schlichting Test voor Taalproductie. Berkhout Nijmegen.
• Schlichting, L., & Lutje Spelberg, H. C. (2010). Schlichting Test voor Taalproductie-II: Handleiding en Verantwoording [Schlichting Test for Language Production-II: Manual and Technical Report]. Bohn Stafleu van Loghum.
• van Weerdenburg, M., Verhoeven, L., & van Balkom, H. (2006). Towards a typological description of children with specific language impairment. Journal of Speech, Language, and Hearing Research, 49(3), 577–597. https://doi.org/10.1044/1092-4388(2006/043)

Items of the Scale