Instruction of the present day is becoming more individual than it formerly was. Greater emphasis is being placed on individual interests, on individual needs, and on the use of practice and instructional tests and of administrative procedures which stimulate individual growth and progress. Nevertheless, there is evidence that large numbers of pupils are not making normal growth. The deficiencies of such pupils must be more intelligently diagnosed. Diagnosis in silent reading is an attempt to discover the causes of disabilities in reading. An effort is made to determine the particular strength in the various skills and habits which the good reader should possess. The diagnosis should involve a careful, accurate, quantitative and qualitative analysis of these skills and habits and should ultimately serve as a basis for remedial instruction. This procedure, in order to be successful, should be directed by an examiner who has certain essential qualities, which are listed by Sangren as follows: