Sentence:  The system well understands that one of its primary responsibilities is to bring children and books together ; consequently an experienced children 's librarian at headquarters conducts a guidance program designed to promote well-planned library activities , <WSD>cooperating</WSD> with the children 's librarians in member libraries by means of individual conferences , workshops , and frequent visits . 
Meaning of the word marked with <WSD> tags:  work together on a common enterprise of project