Article 169. Classification of Mental Retardation. –

Mental Retardation is divided into four classifications:

1. Custodial Group.

   The members of this classification are severely or profoundly retarded, hence, the least capable group. This includes those with I.Q.s to 25.

2. Trainable Group.

   The members of this group consist of those with I.Q.s from about 25 to about 50; one who belongs to this group shows a mental level and rate of development which is 1/4 to 1/2 that of the average child, is unable to acquire higher academic skills, but can usually acquire the basic skills for living to a reasonable degree. He can likewise attain a primary grade level of education if he receives effective instruction.

3. Educable Group.

   This group’s I.Q. ranges from about 50 to about 75, and the intellectual development is approximately 1/2 to 3/4 of that expected of a normal child of the same chronological age. The degree of success or accomplishment that they will reach in life depends very much on the quality and type of education they receive, as well as on the treatment at home and in the community. Many of the educable retardates may reach 5th or 6th grade educational level and can develop occupational skills which may result in partial or complete economic independence in adulthood.

4. Borderline or Low Normal Group.

   This is the highest group of mentally retarded, with I.Q.s from about 75 to about 89. The members of this classification are only slightly retarded and they can usually get by in regular classes if they receive some extra help, guidance and consideration. They have to spend much more time with their studies than do most children in order to pass. Those who cannot make it are usually handicapped by one or more other conditions aside from that of intelligence.