Hi, 

I have two custom objects: Library and employees. Each employee record represents information about a user in the company. One of the fields is department.

In library i publish useful articles. 

How can I make salesforce search and assign tasks to employees to read a publisehd article when i select department "marketing" in the library object. Same field and value exists in employee object.

to sum up - when I publish an article for marketing I want each employee in markteing to get a task to read the article.