To reduce the hazardous behaviour of swimming pool slide users five warning messages were identified. For each warning nine symbols were developed. The comprehensibility of the symbols was tested using an evaluation procedure based to a large extent on the ISO testing procedure to determine the comprehensibility of public information symbols. Respondents were 202 swimming pool users between 7 and 19 years of age. Seven acceptable symbols were found referring to four of the five warnings.
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Boersema et al. (1989) studied this question.