I have taken over the management of a website which will be completely rebuilt. The site currently uses three domains which was set up by the previous webmaster. When clicking through the website you don't really notice anything unless you look in the address bar. Is this a good idea to continue to use or should I consider using just the one domain name? I guess by using several domain names is that it is easy to update without affecting the rest of the site. Does Google like this? Content is spread over the three domains. Thanks in advance for your advice.