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Aim: To describe the development of an intervention-specific fidelity measure and its utilization and to determine whether the newly developed Sitting Together and Reaching to Play (START-Play) intervention was implemented as intended. Also, to quantify differences between START-Play and usual early intervention (uEI) services. Method: A fidelity measure for the START-Play intervention was developed for children with neuromotor disorders by: (1) identifying key intervention components; (2) establishing a measurement coding system; and (3) testing the reliability of instrument scores. After establishing acceptable interrater reliability, 103 intervention videos from the START-Play randomized controlled trial were coded and compared between the START-Play and uEI groups to measure five dimensions of START-Play fidelity, including adherence, dosage, quality of intervention, participant responsiveness, and program differentiation. Results: Fifteen fidelity variables out of 17 had good to excellent interrater reliability evidence with intraclass correlation coefficients (ICCs) ranging from 0.77 to 0.95. The START-Play therapists met the criteria for acceptable fidelity of the intervention (rates of START-Play key component use [greater than or equal to]0.8; quality ratings [greater than or equal to]3 [on a scale of 1-4]). The START-Play and uEI groups differed significantly in rates of START-Play key component use and quality ratings. Interpretation: The START-Play fidelity measure successfully quantified key components of the START-Play intervention, serving to differentiate START-Play from uEI.

Therapies for children with cerebral palsy (CP) often fail to address essential components of early rehabilitation: intensity, child initiation, and an embodied approach. Sitting Together And Reaching To Play (START-Play) addresses these issues while incorporating intensive family involvement to maximize therapeutic dosage. While START-Play was developed and tested on children aged 7-16 months with motor delays, the theoretical construct can be applied to intervention in children of broader ages and skills levels. This study quantifies the impact of a broader STARTPlay intervention combined with Botulinum toxin-A (BoNT-A) and phenol on the developmental trajectory of a 24 month-old child with bilateral spastic CP. In this AB +1 study, A consisted of multiple baseline assessments with the Gross Motor Function Measure-66 and the Assessment of Problem Solving in Play. The research participant demonstrated a stable baseline during A and changes in response to the combination of BoNT-A/phenol and 12 START-Play sessions during B, surpassing the minimal clinically important difference on the Gross Motor Function Measure-66. The follow-up data point (+1) was completed after a second round of BoNT-A/phenol injections. While the findings suggest the participant improved his gross motor skills with BoNT-A/phenol and START-Play, further research is needed to generalize these findings.

Purpose: To evaluate the validity, reliability, and sensitivity of the novel Means-End Problem-Solving Assessment Tool (MEPSAT). Methods: Children with typical development and those with motor delay were assessed throughout the first 2 years of life using the MEPSAT. MEPSAT scores were validated against the cognitive and motor subscales of the Bayley Scales of Development. Intra- and interrater reliability, developmental trends, and differences among groups were evaluated. Results: Changes in MEPSAT scores positively related to changes in Bayley scores across time for both groups of children. Strong intra- and interrater reliability was observed for MEPSAT scoring across all children. The MEPSAT was sensitive to identify change across time and differences in problem-solving among children with varying levels of motor delay. Conclusions: The MEPSAT is supported by validity and reliability evidence and is a simple tool for screening early problem-solving delays and evaluating change across time in children with a range of developmental abilities. What this adds to the evidence: The novel MEPSAT is supported by validity and reliability evidence. It is sensitive to detect problem-solving differences among young children with varying motor ability and to capture changes in problem-solving across time. It requires minimal equipment and time to administer and score and, thus, is a promising tool for clinicians to screen for early problem-solving delays or to track intervention progress in young children with or at risk for problem-solving delays.

The development of independent sitting changes everyday opportunities for learning and has cascading effects on cognitive and language development. Prior to independent sitting, infants experience the sitting position with physical support from caregivers. Why does supported sitting not provide the same input for learning that is experienced in independent sitting? This question is especially relevant for infants with gross motor delay, who require support in sitting for many months after typically developing infants sit independently. We observed infants with typical development (n = 34, ages 4-7 months) and infants with gross motor delay (n = 128, ages 7-16 months) in early stages of sitting development, and their caregivers, in a dyadic play observation. We predicted that infants who required caregiver support for sitting would spend more time facing away from the caregiver and less time contacting objects than infants who could sit independently. We also predicted that caregivers of supported sitters would spend less time contacting objects because their hands would be full supporting their infants. Our first two hypotheses were confirmed; however, caregivers spent surprisingly little time using both hands to provide support, and caregivers of supported sitters spent more time contacting objects than caregivers of independent sitters. Similar patterns were seen in the group of typically developing infants and the infants with motor delay. Our findings suggest that independent sitting and supported sitting provide qualitatively distinct experiences with different implications for social interaction and learning opportunities.

Objective: Our objective was to evaluate the efficacy of the Sitting Together and Reaching to Play (START-Play) intervention in young infants with neuromotor disorders. Method: This randomized controlled trial compared usual care-early intervention (UC-EI) with START-Play plus UC-EI. Analyses included 112 infants with motor delay (55 UC-EI, 57 START-Play) recruited at 7 to 16 months of age across 5 sites. START-Play included twice-weekly home visits with the infant and caregiver for 12 weeks provided by physical therapists trained in the START-Play intervention; UC-EI was not disrupted. Outcome measures were the Bayley Scales of Infant and Toddler Development, Third Edition (Bayley); the Gross Motor Function Measure; reaching frequency; and the Assessment of Problem Solving in Play (APSP). Comparisons for the full group as well as separate comparisons for infants with mild motor delay and infants with significant motor delay were done. Piecewise linear mixed modeling estimated short- and long-term effects. Results: For infants with significant motor delay, positive effects of START-Play were observed at 3 months for Bayley cognition Bayley fine motor, and APSP and at 12 months for Bayley fine motor and reaching frequency outcomes. For infants with mild motor delay, positive effects of START-Play for the Bayley receptive communication outcome were found. For the UC-EI group, the only difference between groups was a positive effect for the APSP outcome, observed at 3 months. Conclusions: START-Play may advance reaching, problem-solving, cognitive, and fine motor skills for young infants with significant motor delay over UC-EI in the short term. START-Play in addition to UC-EI may not improve motor/cognitive outcomes for infants with milder motor delays over and above usual care. Impact: Concepts of embodied cognition, applied to early intervention in the START-Play intervention, may serve to advance cognition and motor skills in young infants with significant motor delays over usual care early intervention. Lay Summary: If you have a young infant with significant delays in motor skills, your physical therapist can work with you to develop play opportunities to enhance your child's problem-solving, such as that used in the START-Play intervention, in addition to usual care in order to help your child advance cognitive and motor skills.

Differential item functioning (DIF) is often used to examine validity evidence of alternate form test accommodations. Unfortunately, traditional approaches for evaluating DIF are prone to selection bias. This article proposes a novel DIF framework that capitalizes on regression discontinuity design analysis to control for selection bias. A simulation study was performed to compare the new framework with traditional logistic regression, with respect to Type I error and power rates of the uniform DIF test statistics and bias and root mean square error of the corresponding effect size estimators. The new framework better controlled the Type I error rate and demonstrated minimal bias but suffered from low power and lack of precision. Implications for practice are discussed.

Despite much research examining whether bilingual individuals demonstrate superior executive function (EF) skills compared to monolinguals, the purported bilingual advantage remains controversial. One potential reason for discrepant findings across studies examining the bilingual advantage is the difficulty in matching monolingual and bilingual groups on important confounding variables that are related to EF. To address this limitation of prior research, we used a propensity score matching approach to evaluate the presence of the bilingual advantage in the Early Childhood Longitudinal Study, Kindergarten Class of 2010-2011. Consistent with recent theories of EF development; we hypothesized that before matching, we would observe bilingual advantages on report- but not performance-based measures of EF. However, we expected that after matching bilingual and monolingual children on a comprehensive set of covariates there would be no group differences in EF. We matched bilingual Spanish-English and monolingual English kindergarteners on a comprehensive set of child- and school-level covariates and conducted a sensitivity analysis to evaluate whether results were sensitive to unobserved confounds. After matching groups (n = 252 matched pairs of monolingual and bilingual children), bilinguals had greater teacher-rated inhibitory control and attentional focus than did monolinguals; however, only the effect for inhibitory control was robust to unobserved confounds. In contrast, no effects of bilingualism were observed for performance-based measures of working memory or cognitive flexibility. Results are discussed in the context of recent theoretical models of EF development in early childhood.

Background: There is limited research examining the efficacy of early physical therapy on infants with neuromotor dysfunction. In addition, most early motor interventions have not been directly linked to learning, despite the clear association between motor activity and cognition during infancy. Objective: The aim of this project is to evaluate the efficacy of Sitting Together And Reaching To Play (START-Play), an intervention designed to target sitting, reaching, and motor-based problem solving to advance global development in infants with motor delays or neuromotor dysfunction. Design: This study is a longitudinal multisite randomized controlled trial. Infants in the START-Play group are compared to infants receiving usual care in early intervention (EI). Setting: The research takes place in homes in Pennsylvania, Delaware, Washington, and Virginia. Participants: There will be 140 infants with neuromotor dysfunction participating, beginning between 7 to 16 months of age. Infants will have motor delays and emerging sitting skill. Intervention: START-Play provides individualized twice-weekly home intervention for 12 weeks with families to enhance cognition through sitting, reaching, and problem-solving activities for infants. Ten interventionists provide the intervention, with each child assigned 1 therapist. Measurements: The primary outcome measure is the Bayley III Scales of Infant Development. Secondary measures include change in the Early Problem Solving Indicator, change in the Gross Motor Function Measure, and change in the type and duration of toy contacts during reaching. Additional measures include sitting posture control and parent-child interaction. Limitations: Limitations include variability in usual EI care and the lack of blinding for interventionists and families. Conclusions: This study describes usual care in EI across 4 US regions and compares outcomes of the START-Play intervention to usual care.

Evaluations of measurement invariance provide essential construct validity evidence--a prerequisite for seeking meaning in psychological and educational research and ensuring fair testing procedures in high-stakes settings. However, the quality of such evidence is partly dependent on the validity of the resulting statistical conclusions. Type I or Type II errors can render measurement invariance conclusions meaningless. The present study used Monte Carlo simulation methods to compare the effects of multiple model parameterizations (linear factor model, Tobit factor model, and categorical factor model) and estimators (maximum likelihood [ML], robust maximum likelihood [MLR], and weighted least squares mean and variance-adjusted [WLSMV]) on the performance of the chi-square test for the exact-fit hypothesis and chi-square and likelihood ratio difference tests for the equal-fit hypothesis for evaluating measurement invariance with ordered polytomous data. The test statistics were examined under multiple generation conditions that varied according to the degree of metric noninvariance, the size of the sample, the magnitude of the factor loadings, and the distribution of the observed item responses. The categorical factor model with WLSMV estimation performed best for evaluating overall model fit, and the categorical factor model with ML and MLR estimation performed best for evaluating change in fit. Results from this study should be used to inform the modeling decisions of applied researchers. However, no single analysis combination can be recommended for all situations. Therefore, it is essential that researchers consider the context and purpose of their study.

Using data from a Midwest project, this study examines malleable factors associated with the reduction of language, achievement, and social-emotional development gaps among Black, Latine, and White children at the end of kindergarten. Gaps at the end of kindergarten between Latine and White children in expressive language, and between Black and Latine children in teacher-reported problem behaviors, remained after controlling for pre-kindergarten attendance and skills, and child and family characteristics. The home-school connection was associated with reducing the gap between Black and Latine children in teacher-rated problem behaviors after the inclusion of all malleable factors. Parenting practices, home-school connection, and classroom environments were not associated with reducing Latine-White gaps in expressive language. These findings highlight that achievement gaps should not be solely attributed to children; they start before kindergarten and underscore the importance of intervening early and strengthening the home-school connection for children from minoritized groups.

Social-behavioral functioning during early childhood is associated with children's academic and social success concurrently and over time. This study explored how concurrent, year-to-year, and sustained parent--teacher and student--teacher relationships predicted children's social skills and problem behaviors across the preschool to Grade 1 transitions. Participants were 233 children (M = 5.32 years [SD = 0.27] in preschool), their parents, and their preschool (n = 65), kindergarten (n = 116), and first grade (n = 117) teachers enrolled in low-income public schools in rural and urban communities. Research Findings: Children's relationships with teachers were associated with social-behavioral functioning immediately and over time. Positive, sustained relationships from preschool through first grade predicted social-behavioral benefits. Conflictual relationships related to higher problem behaviors. Parent-teacher relationships as reported by teachers predicted children's positive social-behavioral functioning in the same year. Parents' reports of close relationships with teachers predicted more problem behaviors in the following year. Sustained relationships between parents and teachers during the transition from preschool through first grade predicted improved social skills and fewer problem behaviors over time. Practice or Policy: Providing targeted training and support for educators to develop and maintain relationships with students and parents can improve social-behavioral outcomes for children across the preschool to 1st grade transition.

Substantial evidence endorses the early assessment of cognitive development to promote children's developmental health and well-being. Especially in the Brazilian context, there is a paucity of standardized screening and assessment tools with normative data to evaluate young children. This study provided initial reliability and validity evidence to support the use of the Cognitive Scale of the Dimensional Inventory for Child Development Assessment (IDADI) in a Brazilian sample of 1,174 4 to 72-months-olds. The inventory includes 106 maternal report items that assess increasingly sophisticated cognitive skills attained by children. Rasch analysis indicated excellent internal consistency of scores and optimal participant discrimination. Person separation was 10.67 and reliability was 0.99. Items sufficiently spanned cognitive abilities with an item separation of 35.81 and reliability of 1.00 (mean infit=0.95 [SD=0.28], mean outfit=1.63 [SD=1.97]). Items' hierarchy was consistent with expectations regarding the developmental difficulty of various cognitive skills. Cluster analysis indicated different patterns of association between cognitive development and age, and a cluster predominantly of children with developmental disorders. IDADI scores correlated with relevant criteria variables, such as age, developmental diagnosis, maternal education, and the Strengths and Difficulties Questionnaire, supporting the use of IDADI as a psychometrically sound measure of cognitive development.

Purpose: This case series documents developmental changes over time and in response to a novel intervention, Sitting Together and Reaching to Play (START-Play), in children with early-life seizures. Methods: Thirteen children with early-life seizures were included from a subset of participants in the START-Play multisite, randomized controlled trial. Seven received 3 months of twice weekly START-Play intervention; 6 continued with usual care early intervention. Bayley Scales of Infant Development-III (Cognitive Composite), Gross Motor Function Measure-66 Item Set, Assessment of Problem-Solving in Play, and reaching assessments were administered at baseline, 3, 6, and 12 months postbaseline. Change scores are reported at 3 and 12 months postbaseline. Results: Over time, plateau or decline was noted in standardized cognition measures; motor development improved or was stable. Children receiving START-Play showed positive trends in problem-solving (71.4%) and reaching behaviors (57.2%). Conclusions: Interventions such as START-Play that combine motor and cognitive constructs may benefit children with early-life seizures.

The purposes of this study were to (a) explore whether early fractions understanding at 4th grade is differentially challenging for students with versus without adequate whole-number competence and (b) identify specific whole-number skill associated with difficulty in fractions understanding. Based on initial whole-number competence, 1,108 4th graders were classified as having (a) adequate whole-number competence (n = 775), (b) less severe whole-number difficulty (n = 201), and (c) severe whole-number difficulty (n = 132). At the end of 4th grade, they were assessed on fractions understanding and further classified as with versus without difficulty in fractions understanding. Multi-level logistic regression indicated that compared to students with adequate whole-number competence, those with less severe whole-number difficulty were almost 5 times as likely to experience difficulty with fractions understanding whereas those with severe whole-number difficulty were about 32 times as likely to experience difficulty with fractions understanding. Students with severe whole-number difficulty were about 7 times as likely to experience difficulty with fractions understanding compared to those with less severe whole-number difficulty. Among students with adequate whole-number competence, the pretest whole-number skill distinguishing those with versus without difficulty in fractions understanding was basic division facts (i.e., 2-digit dividend ÷ 1-digit divisor) and simple multiplication (i.e., 3-digit × 1-digit without regrouping). The role of whole-number competence in developing initial fractions understanding and implications for instruction are discussed.

A critical aspect of rural research is carefully defining and describing the rural context. This is particularly important in rural special education research because different definitions of rural may influence resource allocation, grant funding eligibility, and/or research findings. In order to highlight the importance of operationalizing rural, we discuss the challenges of defining rural, provide descriptions of commonly used definitions to familiarize readers with standardized coding schemes, and summarize an empirical example demonstrating the implications different definitions can have on rural special education research and policy. We conclude by providing recommendations for both producers and consumers of research.

Teachers Speak was a national survey study designed to investigate the characteristics of rural elementary school teachers' existing professional development; differences in professional development practices between rural and non-rural settings; and the potential influence of professional development characteristics on rural teachers' knowledge, perceptions, and instructional practice. The respondents included 268 rural and 327 non-rural (city, suburban, town) teachers whose schools were selected via stratified random sampling. Key findings indicate that professional development experiences, perceptions, and classroom practices were similar for rural and non-rural teachers. Rural teachers did not appear to be comparatively disadvantaged, at least not in terms of their best professional development experiences. They reported comparable characteristics for professional development (e.g., providers, hours, practice and feedback opportunities, collaboration opportunities). An emphasis on topics during professional development was found to be related to increased (a) positive perceptions of the utility of the topics, (b) perceptions of knowledge gained pertaining to those topics, and (c) increased focus on those topics during classroom instruction. Perceived utility of instructional topics was a significant predictor of reported practice. When including both rural and non-rural teachers, time in professional development was found to be a significant predictor of their pedagogical content knowledge.

The present study examined parent-teacher congruent communication within conjoint behavioral consultation (CBC). Specifically, the study purpose was to determine the extent to which congruence in parent-teacher communication (i.e., the degree to which parents and teachers view their communication in a similar fashion) moderated CBC's effects on children's social skills. Drawn from a large randomized trial investigating the efficacy of CBC, the participants were 166 children and their parents and 74 teachers. The findings suggested that CBC's effects on teacher-reported children's social skills depend on congruent parent-teacher communication. Specifically, for students whose parents and teachers have these communication conditions, social skills are expected to increase only in the context of the CBC intervention. Implications for CBC research and school-based consultation are discussed.

Defining rural is a critical task for rural education researchers, as it has implications for all phases of a study. However, it is also a difficult task due to the many ways in which rural can be theoretically, conceptually, and empirically operationalized. This article provides researchers with specific guidance on important theoretical and operational considerations relevant to conducting quantitative rural education research: identifying a rural definition, selecting appropriate analytic methods, and thoroughly communicating rural details to situate the findings within the broader rural literature base. In addition, this article uses the Early Childhood Longitudinal Study, Kindergarten Class of 1998-99 (ECLS-K) and three rural definitions to illustrate how parameter estimates and substantive interpretations are impacted by the statistical model, rural definition, and exclusion/inclusion of covariates. We believe that informed consideration and implementation of the article's guidelines will enhance and clarify the quantitative literature on rural education.

This study aimed to explore whether early developmental abilities are related to future executive function (EF) in children with motor delays. Fourteen children with motor delays (Mean age = 10.76, SD = 2.55) were included from a larger study. Object interaction and developmental outcomes (Bayley-III) were evaluated at baseline and 3, 6, and 12 months post-baseline. Bayley-III and EF assessments (Minnesota Executive Function Scale) were conducted at 36 months post-baseline. Children with high EF demonstrated advanced early bimanual, visual–bimanual, receptive language, expressive language, and fine motor skills compared to children with low EF. Significant positive correlations between later Bayley-III and EF scores were found for cognitive, expressive language, and fine motor scores. These preliminary results suggest that early developmental skills support the emergence of EF in children with motor delays. [ABSTRACT FROM AUTHOR]

Purpose: The study explored the distinct contributions of domain-general, behavioral, and reading-specific executive function to reading comprehension, and whether reading fluency and vocabulary moderate or mediate the relations between executive function and reading comprehension. Method: Data were collected from 129 4th and 5th graders (35.66%, 28.68%, 6.98%, and 28.68% for White, Hispanic, African American, and others, respectively; 54% are girls) who completed 9 assessments of domain-general and context-specific working memory, inhibition, and switching. Additionally, children completed assessments of reading comprehension, reading fluency, and vocabulary. Results: After controlling for all variables, among executive function variables, only behavioral and reading-specific executive function independently contributed to reading comprehension. Reading fluency and vocabulary partially mediated the relations between behavioral and reading-specific executive function and reading comprehension. Reading-specific executive function appeared to be particularly important for students with weaker vocabulary. Conclusion: These findings align with the context-specific hypothesis of executive function. Context-specific executive function may be more important than domain-general executive function in reading comprehension. Reading-specific executive function may be a distinct construct representing the integration of domain-general executive function and reading knowledge. This integration can enhance the efficiency of domain-general executive function when reading knowledge is limited, playing a compensatory role in reading comprehension. [ABSTRACT FROM AUTHOR]

Despite the importance of writing skill development, we know very little about how writing instruction is provided to students with visual impairments (VI) with and without co-occurring disabilities (e.g., multiple disabilities, deaf-blindness). The purpose of this study was to survey a national sample of U.S. teachers of students with visual impairments (TSVIs) on several important constructs, including their preparation to teach writing; their beliefs, attitudes, and experiences about teaching writing; and the writing practices they use for students with various visual conditions. We received responses from 457 TSVIs. The results showed that TSVIs vary considerably in their preparation to teach writing and disagree as to whether writing instruction (above and beyond braille) is part of their responsibilities. Most TSVIs indicated that they believe writing to be important for their students with VI, and they reported using various writing practices in their instruction within different student groups. [ABSTRACT FROM AUTHOR]

This study evaluated whether parenting and childcare experience across infancy and toddlerhood were associated with children's reading, math, and social-behavioural skills prior to kindergarten entry. Analyses also examined whether race or ethnicity moderated associations. A representative sample of Hispanic, Black, and White children from the Early Childhood Longitudinal Study -- Birth Cohort (N = 4550) was used. Parents' responsiveness in infancy and supportiveness in toddlerhood, as well as the home learning environment in toddlerhood, related to academic and social--emotional and behavioural readiness. Associations between certain parenting behaviours and child outcomes varied as a function of race. Additionally, compared to parent-only childcare, attendance in centre-based care at two years of age related to higher early math skills. Findings highlight the need for culturally specific early intervention to support parents in shaping early social-emotional skills in children, and suggest that exposure to centre-based childcare in the toddler years may benefit math readiness.

Young children's temperament was examined as a potential predictor of early adolescent school engagement, with elementary school teacher-child and peer relationships included as potential mediators of these effects. A large national longitudinal dataset (N = 1,032) was used to estimate structural equations models that showed children's social dissatisfaction and teacher-child closeness mediated links from early temperament (i.e., negative affect, effortful control at age 54 months) to early adolescent (age 11) emotional engagement in school. These findings suggest that aspects of teacher and peer relationships in elementary school classrooms are key mediators of the long-term effects of early childhood temperament on later school engagement.

Background: Family child care is commonly used in the US by families, including by those receiving child care subsidies. Psychosocial influences upon the workforce and professional development participation of family child care providers (FCCPs) have implications for the investment of public dollars that aim to improve quality and stability of child care. Objective: We examined psychosocial influences upon workforce and professional development participation of FCCPs. We hypothesized lower levels of psychosocial stress and higher levels of peer support would be associated with less consideration of exit. We hypothesized that those providers embracing a greater sense of themselves as ECE professionals and reporting the support of professional peers would have greater participation in professional development. Methods: This study employed the use of administrative survey data in path modeling. Results: Multivariate analyses of survey data indicated that psychosocial stress had a significant, positive association with consideration of exit. In contrast, perceived peer support had a significant, negative association with consideration of exit. A stronger sense of identity as an early care and education professional had a significant, positive association with professional development participation as measured by training hours completed in the past year. The support of professional peers was not observed to have a significant association with professional development participation. Conclusion: Results suggest the importance of considering psychosocial factors in planning workforce development and educational programs for FCCPs. This may include developing supports to help FCCPs cope with the psychosocial stress of care work, build professional identities, and connect with peer providers to promote stability and quality caregiving in the ECE workforce. We propose additional qualitative research aimed at understanding the context of FCC care as a mechanism for informing the development of these supports.

Testlets, or groups of related items, are commonly included in educational assessments due to their many logistical and conceptual advantages. Despite their advantages, testlets introduce complications into the theory and practice of educational measurement. Responses to items within a testlet tend to be correlated even after controlling for latent ability, which violates the assumption of conditional independence made by traditional item response theory models. The present study used Monte Carlo simulation methods to evaluate the effects of testlet dependency on item and person parameter recovery and classification accuracy. Three calibration models were examined, including the traditional 2PL model with marginal maximum likelihood estimation, a testlet model with Bayesian estimation, and a bi-factor model with limited-information weighted least squares mean and variance adjusted estimation. Across testlet conditions, parameter types, and outcome criteria, the Bayesian testlet model outperformed, or performed equivalently to, the other approaches.