AIM The aims of this study were to determine the intra-and interrater reliability of the Dutchlanguage version of the Communication Function Classification System (CFCS-NL) and to investigate the association between the CFCS level and (1) spoken language comprehension and (2) preferred method of communication in children with cerebral palsy (CP). , recruited from rehabilitation centres throughout the Netherlands. Because some centres only contributed to part of the study, different numbers of participants are presented for different aspects of the study. Parents and speech and language therapists (SLTs) classified the communication level using the CFCS. Kappa was used to determine the intra-and interrater reliability. Spearman's correlation coefficient was used to determine the association between CFCS level and spoken language comprehension, and Fisher's exact test was used to examine the association between the CFCS level and method of communication.
METHOD
RESULTSInterrater reliability of the CFCS-NL between parents and SLTs was fair (r=0.54), between SLTs good (r=0.78), and the intrarater (SLT) reliability very good (r=0.85). The association between the CFCS and spoken language comprehension was strong for SLTs (r=0.63) and moderate for parents (r=0.51). There was a statistically significant difference between the CFCS level and the preferred method of communication of the child (p<0.01). Also, CFCS level classification showed a statistically significant difference between parents and SLTs (p<0.01).
INTERPRETATION These data suggest that the CFCS-NL is a valid and reliable clinical tool toclassify everyday communication in children with CP. Preferably, professionals should classify the child's CFCS level in collaboration with the parents to acquire the most comprehensive information about the everyday communication of the child in various situations both with familiar and with unfamiliar partners.Within the activity level of the International Classification of Functioning, Disability and Health for Children and Youth (ICF-CY), communication is described as transmitting and receiving messages in different environments using multiple means including listening, speaking, reading, and writing.1 Functional communication is defined as the ability to receive or convey a message regardless of the method of communication, and to communicate effectively and independently in a given environment.1 Thus, communication also encompasses conversation and the use of communication aids and techniques, namely augmentative and alternative communication (AAC). Moreover, to operate both as a listener and as a speaker in communicative exchanges, children must develop functional communication skills that include the ability to comprehend and produce language.2 Expressive communication refers to transmitting messages using gesture, production of speech, writing, AAC, or signing. Receptive communication refers to receiving messages, using comprehension of signs or symbols reading, and spoken language.