Google Docs is designed with sharing in mind, but you can set different levels of access to limit or increase the number of collaborators on a particular document. This article explains how to add collaborators to a document and how to use Google Docs' various sharing options to grant access to each user.
How to: Change file permissions in Google Docs
All access rights are handled through the Google Docs sharing settings. You can access the sharing menu via your Google Drive or directly in the document.
Open the document you want to share and click the blue Share button in the top right corner.
To add an individual employee, type his/her name or email address in the text box.