The development of the high speed digital computer made the construction of large scale data processing and large real time control systems feasible. The improvement of sensor and communication devices led to systems of great sophistication. Improvement must now be made in the machine's ability to work with deteriorated or oth rwi e more compl data. T e ample u ed i textual and spoken data. This data is important to system op ration in two ways; (1) a large volume of communication between systems is by these means; and (2) the simplification of t e hum n's communication with the machine directly. The analysis of the data by different methods can be expected to develop better means of deriving information from signals without a priori knowledge of their exact content and to develop more efficient transmission schemes for those signals. The methods used are basically s atistical. (Author).