Due dilligence process to be undertaken...

You got that right!

What does due diligence mean?
Does that mean a full takeover or just part investment?

Due dilligence is a term for a number of concepts involving either an investagation of a business or person prior signing a contract.
It can be a legal obligation in the process through which a potential acquirer evaluates a company or its assets.

Hope that is some help for you pock peacock