Why were the budget management and library acquisition module in ILS so important?

The library acquisition module is one of the important components of ILS (integrated library system, abbreviated as ILS as follows). However, some small, even medium sized libraries refused or hesitated to use this module for several reasons. This article focused on the discussions why the library acquisition module in ILS was so important for the library budget and purchase management, and what the benefits of using the library acquisition module in ILS were. [ABSTRACT FROM AUTHOR]