THE CLINICAL PUZZLE

Every pediatric occupational therapist has encountered this scenario: A 4-year-old with excellent fine motor skills, good visual perception scores, and established hand dominance still cannot write letters legibly. Meanwhile, another child with weaker motor skills and inconsistent grip produces surprisingly readable work.

What makes the difference?

New data from 185 preschool-age children reveals why handwriting success is so unpredictable and why our traditional assessment approaches may be missing critical pieces of the puzzle.

CURRENT HANDWRITING ASSESSMENT PRACTICES

Occupational therapists typically evaluate handwriting readiness through standardized assessments focusing on visual-motor integration and fine motor skills:

Beery VMI (Visual-Motor Integration), 6th Edition measures the ability to copy geometric forms of increasing complexity. Children progress from simple lines to complex shapes, with performance compared to age-based norms. The assessment assumes that shape copying ability predicts letter formation success.

PDMS-3 (Peabody Developmental Motor Scales, 3rd Edition) assesses fine and gross motor development through grasping and visual-motor integration subtests. The fine motor composite includes tasks similar to letter copying and provides age-based standard scores. While more comprehensive than the Beery VMI alone, it focuses primarily on motor execution.

BOT-2 (Bruininks-Oseretsky Test of Motor Proficiency, 2nd Edition) evaluates fine and gross motor proficiency including precision, integration, and manual dexterity tasks. Many subtests emphasize speed and accuracy under timed conditions, making it useful for identifying motor delays but less specific to handwriting readiness.

The Print Tool evaluates actual letter and number formation in children ages 3 to 7, rating legibility, size, spacing, and alignment. While more functional than shape copying, it requires children to already have some writing exposure.

Developmental Test of Visual Perception (DTVP-3) assesses visual-perceptual and visual-motor skills through tasks including copying, form constancy, and figure-ground discrimination. Performance on these isolated visual tasks is presumed to indicate readiness for integrated writing tasks.

Minnesota Handwriting Assessment evaluates speed, legibility, and form in school-age children who already write, making it less useful for identifying preschool readiness factors.

THE RESEARCH

We analyzed 185 children ages 4 to 4.5 years who received occupational therapy evaluations in North Carolina. This clinical sample consisted of children referred for developmental concerns, with 95 percent qualifying for Medicaid services. Many had limited exposure to structured preschool settings.

The children were given a comprehensive evaluation using O.T. Wizard and included 8-10 domains per child. During evaluation, children completed a letter copying task: 10 uppercase letters arranged from developmentally simple (L, F, R) to complex (S, X, N). Children copied each letter into a defined box below the model. Occupational therapists rated both the quality of letter production and the child’s behavior during the task.

The use of uppercase letter copying rather than geometric shapes in preschool assessment warrants clarification. For children lacking letter recognition, uppercase letters serve as geometric forms with the added benefit of providing functional, longitudinal work samples. Unlike abstract shapes that become irrelevant once writing instruction begins, letter samples document the progression from letters-as-shapes to letters-as-symbols, capturing both motor and cognitive development across the transition to formal writing.

We then examined how well various factors predicted performance on this functional handwriting task. Rather than assuming certain skills matter most, we calculated correlations to let the data reveal which factors actually related to success.

UNDERSTANDING CORRELATION: THE “r” VALUE

Before presenting findings, it helps to understand what correlation means and how to interpret the numbers.

Correlation measures the strength of the relationship between two variables. The correlation coefficient, represented as r, ranges from 0 to 1.0:

r = 0.0 to 0.1: No meaningful relationship

r = 0.1 to 0.3: Weak relationship 

r = 0.3 to 0.5: Moderate relationship

r = 0.5 to 0.7: Strong relationship 

r = 0.7 to 1.0: Very strong relationship

A simple example: Height and shoe size have a strong correlation (r = approximately 0.7). Taller people tend to wear larger shoes, though exceptions exist. The relationship is strong but not perfect.

In contrast, height and intelligence have essentially no correlation (r = approximately 0.0). Knowing someone’s height tells you nothing about their cognitive ability.

For our study, correlation indicates how well each skill predicts letter copying success. A high correlation means children with strong skills in that area tend to perform better on writing tasks. A low correlation means the skill does not reliably predict writing performance.

THE FINDINGS

Six factors showed moderate correlations with handwriting (visual motor integration) performance, all clustering tightly between r = 0.31 and r = 0.39:

Fine Motor Skills: r = 0.393 

Cooperation (during evaluation): r = 0.365 

Visual Perception: r = 0.340 

Attention (during evaluation):r = 0.314

Praxis (Motor Planning): r = 0.314 

Participation (during writing task): r = 0.310

The most striking finding is not which factor ranked highest, but rather that all six fell within an 8-point range. Fine Motor scored highest at 0.393, but Participation scored 0.310, a difference of only 0.083.

Statistical interpretation: All six predictors are moderate in strength, and none dominates. The child with the highest fine motor score has only a slightly better chance of writing success than the child with the highest cooperation score.

VISUAL PERCEPTION SUBDOMAINS: TASK DEMANDS MATTER

An interesting pattern emerged when examining visual perception subdomains separately. Not all visual skills predicted copying performance equally:

Visual Discrimination: r = 0.379 

Visual Figure Ground: r = 0.304 

Visual Spatial Relations: r = 0.158 

Visual Memory: r = 0.137

Visual Discrimination, the ability to see small differences between similar forms, predicted letter copying better than the overall Visual Perception domain score. This makes perfect sense given the task demands. Copying letters requires discriminating between similar features: Is this a C or an O? Does this letter have a diagonal line or a curve? Are these two vertical lines parallel or converging?

In contrast, Visual Memory showed the weakest correlation at r = 0.137, barely above no relationship at all. This finding initially seems surprising given that handwriting literature often emphasizes visual memory as critical for letter formation.  However, the weak correlation makes complete sense when we consider the actual task. Children were asked to copy letters with the model remaining visible throughout. They could look back and forth between the stimulus letter and their work as many times as needed. Visual memory is irrelevant when the visual information stays available.

Visual memory would matter for different handwriting tasks: Writing letters from dictation (hear the letter name, recall what it looks like) Writing spelling words independently (recall the letter in memory) Reproducing letters after brief exposure (look once, then write from memory)

But for direct copying with continuous visual access to the model, discrimination ability predicts success while memory does not.

This finding has important implications for assessment practices. If we evaluate visual memory but not visual discrimination, we may be measuring the wrong visual skill for near point copying tasks. Comprehensive assessment requires matching the skills tested to the actual task demands the child will face in the classroom.

In preschool and early kindergarten, children primarily engage in near point copying: copying letters from a worksheet placed directly in front of them, tracing over models, and reproducing shapes from a stimulus card on the table. These near point tasks allow continuous visual reference, making discrimination critical and memory less important.

As children progress through elementary school, task demands shift to far point copying: copying from the board, reproducing teacher demonstrations, writing from dictation. These tasks require visual memory because the model is not continuously accessible. A child must look at the board, hold the letter image in memory while looking down at paper, then reproduce from that mental representation.

For the preschool population in this study engaged in near point copying tasks, visual discrimination predicted success while visual memory did not. This relationship may change for older children performing far point copying or writing from dictation.

WHAT THE NUMBERS MEAN IN PRACTICE

Consider what these moderate correlations reveal:

If fine motor skills were the primary driver of handwriting, we would expect r = 0.6 or higher. Instead, r = 0.393 means fine motor capability explains only about 15 percent of handwriting performance. The remaining 85 percent depends on other factors.

Similarly, visual perception (r = 0.340) explains about 12 percent. Praxis explains about 10 percent. Cooperation explains about 13 percent.

No single factor accounts for even 20 percent of performance. Handwriting emerges from complex interactions among multiple systems, not mastery of any single prerequisite.

THE BEHAVIORAL FACTOR SURPRISE

Perhaps most notable: Behavioral factors predicted success as well as skill factors.

Cooperation (r = 0.365) nearly matched fine motor skills (r = 0.393). A child who cooperates with feedback and accepts correction has almost the same probability of writing success as a child with superior hand strength and coordination.

Attention during evaluation (r = 0.314) predicted exactly as well as motor planning ability (r = 0.314). The child who can focus for the duration of the task performs comparably to the child with better movement sequencing skills.

Participation during the actual writing task (r = 0.310) predicted nearly as well as any other factor. Willingness to engage with the challenge matters almost as much as capability.

This explains common clinical observations:

The child with excellent fine motor skills who gives up after one attempt struggles more than the child with weaker skills who persists through frustration.

The child who resists feedback and insists on doing it “my way” fails to improve despite adequate motor capability.

The child who cannot sustain attention long enough to complete three letters never accumulates the practice necessary for skill development.

CONTEXT MATTERS: THE 1-ON-1 EVALUATION PROBLEM

An important limitation: Cooperation, attention, and participation were rated during one-on-one evaluation sessions with an occupational therapist providing full support and individualized pacing.

This context differs dramatically from classroom writing instruction, where:

One teacher manages 15 to 20 students simultaneously Individual feedback is limited and delayed Pacing is group-determined rather than individualized Distractions are constant Tasks continue for extended periods without breaks

A child rated as having “adequate cooperation” in a quiet therapy room with undivided therapist attention may demonstrate very different behavior in a busy kindergarten classroom during 15-minute writing periods.

This suggests our correlations may actually underestimate the importance of behavioral factors. If cooperation, attention, and participation predict success even in optimal conditions, they likely matter even more in typical educational settings.

IMPLICATIONS FOR ASSESSMENT PRACTICES

Current handwriting readiness assessments focus heavily on visual-motor integration and fine motor skills while largely ignoring behavioral factors. The Beery VMI, for instance, requires sustained attention and task persistence to complete 30 forms, but these behavioral requirements are not scored or interpreted. A child may fail due to attention limitations rather than visual-motor deficits, yet both receive the same low score.

More critically, the Beery VMI is frequently used in isolation to qualify children for occupational therapy services for handwriting concerns. Given our findings, this practice is problematic. Visual-perception represents only one of six factors that predict handwriting success in preschoolers, and it predicts moderately (r = 0.340), not strongly. A child may score low on the Beery VMI yet succeed at functional handwriting due to strong cooperation, attention, and participation. Conversely, a child may pass the Beery VMI but struggle with classroom writing due to behavioral regulation challenges that the assessment does not capture.

Using the Beery VMI as a sole qualifying criterion systematically misidentifies which children need services. Comprehensive evaluation across all six predictive factors provides more accurate identification of handwriting risk.

Additionally, visual perception assessments for preschool populations should emphasize visual discrimination for near point copying tasks. Our findings demonstrate that for preschoolers copying letters with the model continuously visible, discrimination ability (r = 0.379) predicts substantially better than memory (r = 0.137). This does not suggest visual memory is unimportant for handwriting development overall. Rather, it indicates that the specific skills required depend on task type and developmental stage. Visual memory likely becomes increasingly important as children transition to far point copying and writing from dictation in elementary grades.

Ratings of current assessments used by OT’s and how they capture handwriting prediction 

These assessments share common limitations. Based on our findings, we can evaluate how well each captures the six factors that actually predict handwriting success:.

Beery VMI (with supplemental tests): Rating 5/10 IF subtests administered.  3/10 if only the VMI section is administered.  Captures visual-motor integration (r=0.340) through the primary copying task. Supplemental Visual Perception and Motor Coordination subtests add assessment of visual discrimination and fine motor control, bringing total coverage to 2-3 of 6 predictive factors. However, the Visual Perception subtest does not distinguish between visual discrimination (r=0.379, highly relevant) and visual memory (r=0.137, less relevant for near point copying). Completely misses cooperation, attention, praxis, and task participation. When administered with all three subtests, it provides more comprehensive data than VMI alone, but therapists often use only the primary VMI subtest for qualification decisions.

PDMS-3: Rating 6/10 Captures fine motor skills (r=0.393) through grasping subtests and visual-motor integration (r=0.340) through copying tasks. Provides 2 of 6 critical factors. Misses cooperation, attention, praxis, and task participation entirely. No assessment of behavioral regulation during tasks or visual discrimination as distinct from visual-motor integration.

BOT-2: Rating 4/10 Primarily assesses motor proficiency with fine motor precision and integration subtests capturing fine motor skills (r=0.393). However, heavy emphasis on timed performance may penalize slow-but-accurate children. Completely misses visual perception, cooperation, attention, and task participation. Designed for motor proficiency screening rather than handwriting-specific readiness. Captures only 1 of 6 predictive factors.

DTVP-3: Rating 5/10 Assesses visual perception (r=0.340) across multiple subdomains but does not distinguish between visual discrimination (r=0.379, highly relevant for copying) and visual memory (r=0.137, less relevant for near point tasks). Misses fine motor execution, cooperation, attention, praxis, and task participation. Provides visual skills assessment but in isolation from functional writing context.

The fundamental issue: These assessments emphasize isolated skill measurement (motor proficiency, visual perception, visual-motor integration) while ignoring behavioral regulation factors that predict equally well. Additionally, they provide scores but often rely on checklist observations that cannot be converted to continuous metrics for tracking progress or comparing across domains.

Comprehensive assessment should include:

Fine motor capability: Strength, coordination, precision, tool control Visual-perceptual skills with task-appropriate emphasis: Visual discrimination (critical for copying) Visual figure ground (moderate importance) Visual spatial relations (less critical for copying) Visual memory (only relevant for tasks without visible models) Motor planning: Ability to sequence multi-step actions, organize approach Cooperation: Willingness to accept feedback, modify approach when unsuccessful Attention: Capacity to sustain focus through multi-step tasks Task participation: Engagement level, persistence through challenge, frustration tolerance

Single-domain screening (testing only visual skills or only motor skills) will systematically miss children at risk. A child may pass fine motor screening with flying colors but struggle with writing due to attention deficits, poor cooperation, or low task engagement.

Similarly, a child may score well on visual memory subtests but fail at letter copying due to poor visual discrimination. Matching assessed skills to actual task demands is essential.

Conversely, a child with borderline fine motor scores but strong behavioral regulation may achieve functional writing through persistence and acceptance of instruction.

IMPLICATIONS FOR INTERVENTION

Traditional intervention models often follow a sequential approach: establish attention, then build fine motor skills, then introduce visual tasks, then combine into writing. Our data suggests this may be inefficient.

If multiple factors contribute equally and simultaneously, intervention should address them concurrently rather than sequentially. Children need practice integrating behavioral regulation, motor control, visual processing, and motor planning from the start.

Effective intervention might include:

Brief, varied tasks that build attention capacity while practicing motor skills (address both simultaneously) Immediate feedback on both motor execution and behavioral approach (cooperation, persistence) Functional writing activities that require visual processing, motor planning, and sustained attention in authentic context Explicit instruction in self-regulation during challenging tasks (managing frustration, accepting correction)

Isolated prerequisite activities (strengthening exercises, shape sorting, sequencing games) practiced separately from writing context may not transfer effectively. The child builds attention during tabletop games but cannot apply it during writing. The child demonstrates fine motor control during bead threading but not during letter formation.

Integration practice appears more efficient: Work on attention, motor control, visual processing, and cooperation simultaneously within functional writing activities.

WHY SOME CHILDREN SUCCEED DESPITE LIMITATIONS

These findings explain puzzling clinical observations.

The child with weak fine motor skills who succeeds likely compensates through: Strong visual perception (carefully observes letter features) High persistence (keeps trying despite motor difficulty) Good cooperation (accepts feedback, modifies approach) Strong attention (focuses carefully on each stroke)

The combination of strengths in four areas compensates for weakness in one.

The child with excellent fine motor skills who fails likely struggles with: Poor attention (loses focus mid-letter) Low persistence (gives up when first attempt is imperfect) Resistance to feedback (insists on incorrect approach) Low task engagement (avoids writing activities)

Motor capability alone cannot overcome behavioral limitations.

THE CLINICAL SAMPLE CONTEXT

These findings emerge from a specific population: low-income preschoolers referred for occupational therapy evaluation. Many had limited exposure to structured educational settings or formal writing instruction.

This context matters for interpretation:

Children with school experience might show different patterns, as they have had more opportunity to develop attention and cooperation within structured tasks.

Higher-income samples with more educational exposure might demonstrate stronger correlations for skill factors and weaker correlations for behavioral factors.

Typically developing children (not referred for therapy) might show different relationships among variables.

However, this clinical sample represents the population occupational therapists actually serve. Understanding what predicts success in children with developmental concerns and limited educational exposure has direct clinical relevance.

RESEARCH CONTEXT: HOW OUR FINDINGS COMPARE

Our findings align with and extend existing research on handwriting development while revealing some important differences.

Feder and Majnemer (2007) conducted a systematic review identifying visual-motor integration, fine motor skills, and in-hand manipulation as significant predictors of handwriting performance in school-age children. Their meta-analysis found moderate correlations (r = 0.3-0.5) between these factors and handwriting, consistent with our fine motor (r = 0.393) and visual perception (r = 0.340) findings. However, their review focused on older children already engaged in writing instruction, while our sample examined preschoolers in pre-handwriting stages.

Reference: Feder, K. P., & Majnemer, A. (2007). Handwriting development, competency, and intervention. Developmental Medicine & Child Neurology, 49(4), 312-317.

Volman, van Schendel, and Jongmans (2006) examined handwriting readiness in kindergarten children and found that visual-motor integration was a significant predictor but explained only a modest portion of variance. This supports our finding that visual-motor skills predict moderately (r = 0.340) but do not dominate. Importantly, they also identified attention and behavioral regulation as contributing factors, aligning with our cooperation (r = 0.365) and attention (r = 0.314) findings.

Reference: Volman, M. J., van Schendel, B. M., & Jongmans, M. J. (2006). Handwriting difficulties in primary school children: A search for underlying mechanisms. The American Journal of Occupational Therapy, 60(4), 451-460.

Kaiser, Albaret, and Doudin (2009) investigated the relationship between handwriting quality and various factors in first graders. They found visual perception, fine motor skills, and graphomotor skills all contributed, but no single factor was sufficient. Their findings that multiple factors contribute equally strongly support our multifactorial model. However, they did not examine behavioral factors like cooperation or task-specific participation, which our data suggests are equally important.

Reference: Kaiser, M. L., Albaret, J. M., & Doudin, P. A. (2009). Relationship between visual-motor integration, eye-hand coordination, and quality of handwriting. Journal of Occupational Therapy, Schools, & Early Intervention, 2(2), 87-95.

Notably absent from existing literature: Studies examining task-specific participation and cooperation as predictors of handwriting success in preschool populations. Most handwriting research focuses on school-age children who have already received writing instruction and emphasizes motor and perceptual factors while treating behavioral factors as confounding variables rather than legitimate predictors.

Our finding that cooperation predicts nearly as well as fine motor skills (r = 0.365 vs r = 0.393) extends the literature by demonstrating that behavioral regulation deserves equal consideration in handwriting readiness assessment. The clinical sample context (children referred for evaluation, limited school exposure, 95 percent low-income) may explain why behavioral factors emerged as stronger predictors than in general population studies.

Additionally, our visual perception subdomain analysis revealing that visual discrimination (r = 0.379) predicts substantially better than visual memory (r = 0.137) for near point copying tasks provides specificity often missing in broader visual perception assessments. This has practical implications for selecting which visual subtests to administer when evaluating preschool handwriting readiness.

ABOUT OT WIZARD

Data for this analysis was collected through OT Wizard, a clinical intelligence system for pediatric occupational therapy assessment. The platform evaluates performance across up to twelve domains including visual-motor integration, fine motor skills, gross motor skills, praxis, visual perception, executive functioning, activities of daily living, and participation. OT Wizard is undergoing Rasch analysis validation to establish psychometrically sound, norm-referenced scoring with living norms that update continuously as the clinical database expands.

Unlike traditional checklist-based assessments, OT Wizard converts all observations to continuous metrics that enable progress tracking, cross-domain comparison, and comprehensive reporting. The platform captures all six factors identified in this research as predictive of handwriting success: fine motor skills, visual perception (with subdomain specificity), praxis, cooperation, attention, and task participation. Behavioral regulation is assessed within the context of actual task performance rather than as an isolated rating, providing clinically relevant data about how attention and cooperation affect functional skill demonstration.

For handwriting readiness assessment specifically, OT Wizard provides quantified performance across visual discrimination, visual-motor integration, fine motor control, motor planning, and behavioral engagement during writing tasks. This comprehensive approach addresses the multifactorial nature of handwriting development identified in this research. As the platform undergoes Rasch analysis validation and accumulates longitudinal outcome data, it will establish whether comprehensive baseline assessment across all six predictors improves identification of children at risk for handwriting difficulty and informs more effective intervention planning.

OT Wizard is committed to advancing the occupational therapy profession by collecting de-identified clinical data from real therapist users, building the largest developmental database in pediatric occupational therapy history. This continuous data collection enables research on developmental trends, intervention effectiveness, and response to intervention patterns that elevate practice from perception-based to data-driven decision making and strengthen the evidence base for the entire profession