--Meredith LeporeRealpoint, a subsidiary of Morningstar, is discussing a new ratings model in response to Nationally Registered Statistical Rating Organizations (NRSROs) provisions in the recently passed Dodd-Frank Act. The bill makes NRSROs liable for the quality of their calls when they are used for public sale documents. One strategy that could reduce the firm's liability is the point-in-time (PIT) ratings model, the firm's attorneys and investors said. The agency believes sticking to ratings that refer to a specific point in time, as opposed to grading a share class on how it may do in the future, may limit exposure to liability.....