I am in situation where there are many sites which are being merged to one. We want to redirect from former web sites to the new one but we are worried about search engine penalisation. Redirects from many pages with a bit different content and renks to one new.
What is good solution to get visitors to new site and transfer rank too?
addition: There is about 5 websites which all links to one organization but differs some information. To be concrete, boy scouts, each website cowers age group within the organization. So same information are same (addresses, some names, etc.) but some differs. Their creation times also are very different first about 2001, last one 2011. They are on variety of domains and subdomains. Different authors, some use wordpress, the oldest one is almost static.
The new website does not copy pages 1:1 some merge some ignores.