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Introduction Handwriting disorders (HDs) are prevalent in elementary school children, but their nature is poorly understood. Moreover, the diagnosis of dysgraphia is often too quickly concluded on a single assessment. Objectives In the present study, we aimed to use a transdisciplinary assessment approach. We looked for to provide objective data to better understand the nature and aetiology of HDs. Methods 27 school aged children with HDs aged 6-11 years were included in the study and were compared to typically developing children. They performed a normed prescriptural task of copying cycloid loops. Postural and gestural inter-segmental coordination of arm movements were recorded with two video cameras allowing 2D reconstruction of the gesture. Spatial/temporal kinetic and kinematic measures were recorded with a digital pen. All children underwent normed and standardized clinical assessments of neuropsychomotor, neuropsychological and oculomotor functions. The handwriting test (BKK) were used. Results Handwriting disorders seem very heterogeneous. However, there is a significantly poorer gestural of inter-segmental coordination and of kinetic/kinematic performances of the tracings in HDs. Furthermore, it was possible to highlight three levels of HDs: mild HD not detected by the BHK test (26% of children), moderate HD with the BHK (33%), dysgraphia identified by the BHK (41% of children). The mild nature of HDs not dectected by the BHK seems to occur to a relatively low frequency with associated disorders identified during clinical assessments. On the contrary, dysgraphia appears linked to a high frequency of the associated disorders with a majority of oculomotor disorders (55% of children) leading to visual-perceptual difficulties (44%). Conclusions HDs appear to be multifactorial but have a common characteristics of immaturity of gestural synergy of the arm, associated with poorer spatio-temporal kinetic and kinematic parameters. Dysgraphia occurs with more severe disorders as oculomotor and visual perception impairments. Our findings highlight the importance to identified a nosography of HDs with a transdisciplinary evaluation to better understand the nature and aetiology of the disorders in order to better clinical decision-making processes for handwriting remediations. Disclosure of Interest None Declared