Systematic Detection of Writing Problems, revised version

Abstract

The Systematische Opsporing Schrijfproblemen, gereviseerde versie (Systematic Detection of Writing Problems, Revised Version), commonly known as the SOS-2-NL, is a psychological instrument designed to systematically identify the presence and severity of a writing problem in children. This revised edition succeeds the original SOS scale. The assessment integrates two critical components of graphomotor skill: the overall quality of the writing product and the functional handwriting speed.

The administration requires the child to copy a standardized text for a duration of five minutes. The scoring process involves evaluating the quality of the first five lines using seven specific criteria, alongside determining the speed based on the total number of letters written. The SOS-2-NL can be administered in both individual and classroom settings by various professionals, including teachers, specialized care teachers, occupational therapists, and physiotherapists.

Keywords

Writing assessment, Handwriting quality, Handwriting speed, SOS-2-NL, Graphomotor skills, Occupational therapy, Developmental coordination disorder, Children.

Authors

Smits-Engelsman BCM (1999).

Purpose

The primary purpose of the SOS-2-NL is the early and systematic identification of children who exhibit deficits in their writing ability, specifically focusing on the efficiency and legibility of their handwriting. This comprehensive assessment aims to standardize the detection of handwriting difficulties across school settings.

This diagnostic tool provides educators and clinicians with objective data necessary for determining the need for specialized intervention or referral to specialized professionals, such as occupational therapists or physiotherapists. The dual focus on speed and quality allows for a nuanced understanding of the underlying causes of the writing difficulty.

Construct

The scale measures the construct of functional handwriting proficiency, which is operationalized through two distinct but interrelated dimensions: the kinematic aspect (speed) and the spatial/formative aspect (quality). The combined score reflects a child’s overall graphomotor efficiency, which is crucial for successful academic performance, particularly during timed tasks.

Deficits identified by the SOS-2-NL often point toward potential specific learning difficulties related to motor output or broader developmental coordination disorders. By separating the assessment into seven distinct quality criteria, the instrument allows for targeted analysis of specific handwriting errors.

Validity

As a revised instrument, the SOS-2-NL is expected to demonstrate strong structural and concurrent validity, building upon the psychometric properties established by the original SOS scale. The measurement protocol—requiring the copying of a standardized text under timed conditions—ensures high ecological validity, reflecting typical classroom writing tasks.

The scale’s validity rests on the premise that the seven quality criteria accurately capture variances in handwriting legibility and form that are relevant to academic function. Further research typically confirms that the scale differentiates effectively between children with typical handwriting development and those requiring intervention.

Reliability

Given its highly structured administration and objective scoring criteria (seven quality criteria plus a simple letter count for speed), the SOS-2-NL is generally considered to possess high inter-rater reliability, especially when administered by trained professionals. The standardized procedures minimize subjectivity in both the timing and the evaluation of the written product.

Furthermore, the standardized five-minute copying task provides a reliable measure of performance stability over short periods. Test-retest reliability studies are essential to confirm the consistency of scores for children whose underlying writing ability has not changed substantially between administrations.

Factor Analysis

Although specific factor analysis results are not detailed in the summary, the inherent structure of the SOS-2-NL implies a two-factor model corresponding to the core components of handwriting: Writing Quality (assessed via the seven scoring criteria) and Writing Speed (assessed via the letter count). These two factors are generally considered distinct measures of graphomotor function.

It is hypothesized that the quality criteria may load onto a single factor representing legibility and form, while the speed component stands alone. These factors are expected to show a moderate negative correlation, reflecting the common trade-off where increased speed often compromises the quality of the written output.

Instrument

Test Type: Performance measure

Format: Timed copying task; administered individually or classically (group setting).

Language Available: Dutch (NL).

Population Group: Clinical and General Population.

Age Group: Children (Typically primary school age).

Population Details: Used primarily among primary school-aged children to screen for handwriting difficulties, identifying those needing further assessment or intervention.

Test Methodology: The child is instructed to copy a standardized text for exactly five minutes. Scoring involves two main metrics. First, the writing quality of the first five lines of the copied text is evaluated against seven standardized criteria. Second, the handwriting speed is calculated based on the total number of letters correctly written within the five-minute period.

Keywords

Handwriting assessment, Graphology, Motor skills, SOS-2-NL, School screening, Intervention planning, Writing quality, Test performance.

Authors

Author ORCID Identifier: N/A

Affiliation Email addresses: N/A

Correspondence Address: N/A

Permissions & Fee and Test Year

The original development of this revised scale (SOS-2-NL) was completed in 1999 by Smits-Engelsman BCM. Information regarding current licensing, permissions, and administration fees should be obtained directly from the test publisher or distributor.

The explanatory form (Toelichtingsformulier) providing detailed information on the scale is available for download. The original PDF can be downloaded here: Toelichtingsformulier.

Reference’s

Smits-Engelsman BCM (1999). Systematische Opsporing Schrijfproblemen, gereviseerde versie (SOS-2-NL). [Test Manual/Publisher Information].

Items of the Systematische Opsporing Schrijfproblemen, gereviseerde versie

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The SOS-2-NL assesses the quality of the first five lines of copied text based on seven specific criteria. These criteria evaluate aspects such as letter formation, spacing, alignment, and pressure, which contribute to the overall legibility of the handwriting product. The specific items used for the copying task and the detailed breakdown of the seven scoring criteria are contained within the full test manual.