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J Psychopathol Behav Assess. 2018;40(2):249-258. doi: 10.1007/s10862-017-9630-x. Epub 2017 Nov 4.

Reliable and Valid Coding of Thin Slices of Video Footage: Applicability to the Assessment of Mother-Child Interactions.

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Faculty of Psychology, Department of Applied Psychology: Health, Development, Enhancement, and Intervention, University of Vienna, Liebiggasse 5, A-1010 Wien, Austria.


When using behavioral-observation methods for coding video footage, it is unknown how much time of an interaction needs to be coded to gain results that are representative for the behavior of interest. The current study examined this problem using the INTAKT, a standardized observational measure for assessing the quality of mother-child interactions. Results from coding only 10 min of each video (i.e., thin slices) were compared with results from coding the remaining parts (averaging about 40 min) of the interaction. Inter-rater agreement for the short versions taken from the beginning or the middle, but not the end of the interactions indicated satisfactory observer accuracy. Coding results did not differ between short and long video sequences, when sequences were taken from the middle of the interactions. Importantly, characteristic differences between different interactive situations were equally well represented in the short and long video sequences. Therefore, our results show that coding only 10 min of an interaction is as reliable and valid as coding full-length videos, if those short sequences are taken from the middle of an interaction. Our findings support the idea that for every method, it is necessary to individually determine the window duration that is long enough to gain results that are reliable and valid.


Behavioral observation; INTAKT; Mother-child interaction; Reliability; Thin-slice sampling; Validity

Conflict of interest statement

Compliance with Ethical StandardsNicole Hirschmann, Ursula Kastner-Koller, Pia Deimann, Manuel Schmelzer and Jakob Pietschnig declare that they have no conflict of interest.All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.Informed consent was obtained from all individual participants included in the study.

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