Next: Tests Using a Up: Model Updating in the Previous: Model Updating . By virtue of the MU technique, in order to achieve some critical value for data fitting, not only the number of outer iterations but also the number of inner iterations in each outer iteration is reduced. ... Even in this case, and would be two solutions that are not equal because the ``solution space'' (a set formed by all the possible solutions) without model updating is different from that with model updating. ...