SUMMARY. The question of sequence in hearing impaired and hearing children's development of concepts was investigated and a similar order of acquisition of conservation was found regardless of delay. The 24 partially hearing unit, 28 deaf school and 30 hearing ordinary school children, with individual exceptions, yielded the ordering: conservation of number, substance, length, weight, area, volume. Scalogram analyses supported the order with coefficients of reproducibility of C' = 0.93 (z = 4 . 2 P < 0.0002) for the hearing impaired and C' = 0.96 (z = 4.9 P < 0.0002) for the hearing. Whilst scalogram analyses clarified the preferred ordering, they also indicated that more than one sequence was significant, and that there was no single fixed order of development.
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