Answer:
There's a list of important question to be do done:
1. A complete list of credit qualification of each member of the mortgage backed security (MBS) is needed: it is very useful because allow you to know the quality of the product, as in 2008 crisis the issuers of this kind of products put bad credit rate mortgages with good rate.
2. Who is the issuer of the MBS: it helps to determine the quality of the product, because studying the balance sheet is possible to know how healthy the company is
3. Is also important to know the issuer of the mortgage, it means Wich commercial Bank is issuing this kind of products
4-is the product been traded in stock exchange or it OTC ( over the counter). If it is traded OTC is lesser regulated than any stock exchange