一、旧系统的改良在367所图书馆中,有60%以上是近五年(截止1989年)内安装的。几乎85%的系统是1980年后安装的。在被调查的当前安装的系统中,大约有64%的系统是来自十个最大的卖主,剩余的36%则是来自25家公司。此外,令人惊异的是,这367所图书馆中的49.6%已经至少将他们的系统改良过一次。乐观的是,有51.8%的图书馆计划在今后一两年内改进他们的系统。 I. Improvement of the Old System Over 60% of the 367 libraries were installed in the last five years (as of 1989). Almost 85% of the systems were installed after 1980. Of the currently installed systems surveyed, about 64% of the systems come from the ten largest sellers and the remaining 36% come from 25 companies. In addition, surprisingly, 49.6% of the 367 libraries have improved their systems at least once. It is optimistic that 51.8% of libraries plan to improve their systems in the next year or two.