Point-line interlocking blocks are a distinctive construction material in which pieces connect through point-and-line junctions rather than through the stud-based coupling familiar from plastic bricks or the simple stacking of wooden blocks. This geometry changes what a child must understand and do to build successfully. The connections demand finer motor control, an appreciation of how linear elements can define edges and frames, and the ability to plan structures in which points of contact carry the load. Because these blocks are widespread in kindergartens, particularly in China, yet lacked any validated assessment instrument, the researchers set out to fill a genuine gap in the measurement literature.

The team collected data from 350 children aged 43 to 66 months attending kindergartens in Xi’an, a sample spanning the age range in which construction play undergoes rapid developmental change. Each child’s block constructions were scored with the new scale, which was designed to be brief enough for practical classroom use while remaining sensitive to the differentiated levels of ability that emerge across the preschool years. The developers grounded the instrument in decades of research showing that block construction is not a single undifferentiated skill but a constellation of abilities that unfold in predictable developmental sequences.

Using exploratory factor analysis followed by confirmatory factor analysis, the researchers arrived at a 16-item scale organized into three factors: construction skills, representational ability, and aesthetic quality. Construction skills capture the technical mastery of joining, balancing, and stabilizing pieces. Representational ability reflects the degree to which a child’s build stands for something, a tower that is meant to be a castle or an arrangement that depicts a bridge, echoing the long-standing finding that block constructions evolve from sensorimotor exploration toward symbolic expression. Aesthetic quality, the third factor, acknowledges that children’s buildings differ in symmetry, proportion, and visual coherence, dimensions that research on the development of aesthetic preference suggests emerge as cognitive capacities mature.

The statistical evidence for this three-factor structure was strong. The confirmatory model demonstrated good fit, with a comparative fit index of 0.99, a Tucker-Lewis index of 0.99, a root mean square error of approximation of 0.06, and a weighted root mean square residual of 0.75, values that meet or exceed conventional benchmarks for acceptable model fit. Standardized factor loadings ranged from 0.65 to 0.96, indicating that every item contributed meaningfully to its intended factor. In plain terms, the data showed that the 16 items hang together in exactly the way the theory predicted, and that the three dimensions are empirically distinguishable rather than a single blurry general score.

Reliability, the consistency of measurement, was equally robust. The scale showed strong internal consistency, with reliability coefficients ranging from 0.84 to 0.94 across its components. Coefficients in this range mean that scores are stable enough to support individual-level decisions, such as identifying a child who may benefit from additional support or documenting growth over the course of an intervention. The authors also attended to the ordinal nature of their rating data, drawing on contemporary methodological guidance for estimating reliability with Likert-type and ordinal item response data rather than relying solely on older approaches that can misstate precision.

Validity was examined through criterion-related evidence. PLIB scores were significantly associated with two established measures, the Block Construction Scoring Scale and the CA Block Construction Level Assessment Scale, demonstrating that the new instrument converges with existing assessments of block construction while offering its own advantages. Those advantages include brevity, a level-based structure suited to tracking developmental progress, and a focus on point-line interlocking materials that existing scales, most of which were designed for unit blocks or structured assembly tasks, do not directly address. The result is a tool that is both psychometrically defensible and practically usable in real kindergarten settings.

The significance of a validated block construction measure extends well beyond psychometrics. A substantial body of research links early block play to later academic outcomes. Studies have associated the complexity of three-year-olds’ block building with later spatial and mathematical skills, shown that block-building interventions can develop spatial skills, and demonstrated through randomized controlled trials that structured block play can enhance preschool children’s mathematics performance and executive functioning. Longitudinal work has connected preschool block construction with reading and mathematics abilities in early elementary school, including among children with disabilities. Spatial assembly performance in preschoolers has been shown to relate to early mathematical skill, and researchers have argued that spatial and mathematical abilities are intertwined across the preschool years.

Block play also supports capacities that are harder to quantify. Observational research has documented the spatial language children use during block play, the logico-mathematical thinking that emerges when young children experiment with blocks and inclines, and the abstract thinking that video-based studies have linked to sustained construction activity. Work on creativity has found that block play can foster divergent thinking, and studies of make-believe and pretend play situate construction within the broader architecture of executive function development. Teachers’ verbal scaffolding has been shown to influence the complexity of preschoolers’ constructions, and the block area has been described as a site where material and human actors interact in ways that shape learning. A reliable measure of construction ability gives educators a way to observe and document this rich developmental terrain systematically.

For practitioners, the PLIB promises a way to move beyond impressionistic judgments about whether a child is a good builder. Because the scale is level-based, it can locate a child’s current constructions along a developmental continuum and reveal which of the three dimensions, technical skill, symbolic representation, or aesthetic sensibility, is advancing or lagging. That granularity could inform curriculum planning, guide the placement of materials and prompts in the block area, and support communication with families about what block play is actually teaching. For researchers, the validated three-factor structure provides a foundation for studying how point-line interlocking construction develops, how it relates to spatial cognition and mathematics, and whether interventions designed around these blocks produce measurable gains.

The study was funded by a National Education Science Planning Ministry of Education key project focused on kindergarten teachers in western rural China, reflecting a broader policy interest in strengthening early childhood education quality in the region. The authors report no conflicts of interest, and the work involved a large collaborative team spanning preschool education, special education, curriculum and instruction, and the arts. As interlocking construction toys continue to proliferate in classrooms worldwide, the PLIB offers a timely answer to a deceptively simple question: how do we know what a child’s block building reveals about the child? With this scale, educators and scientists now have a validated, practical instrument for finding out.

Subject of Research: Development and validation of the Point-Line Interlocking Block Construction Scale for assessing preschool children's block construction ability

Article Title: A Validated Tool for Assessing Point-Line Interlocking Block Construction in Preschool Children

Article References: A Validated Tool for Assessing Point-Line Interlocking Block Construction in Preschool Children. (n.d.). https://doi.org/10.1007/s10643-026-02321-6

Image Credits: AI Generated

DOI: 10.1007/s10643-026-02321-6

Keywords: block play, preschool children, point-line interlocking blocks, scale validation, psychometrics, confirmatory factor analysis, early childhood education, spatial skills, construction skills, reliability, child development, assessment tool