A set of reusable components was carefully examined, each component of which was reused frequently and with considerably high reputation. 21 components were sampled from this set. Another set of seldomly reused ``reusable'' components was examined, and five components were sampled from this set. Several member companies offered sample reusable components under these two distinctively defined categories: frequently reused and seldomly reused [#!Interim92!#].
For each of these two distinctive sets, we gave scores to each of the components using five ranking methods, one for each of the ISO 9126 sub-characteristics. Comparing the component scores for these two sets, we have tried to find properties or quality characteristics which each category of components commonly holds.