It comes in three forms (for different age groups) and comprises 40 incomplete sentences usually only 1–2 words long, such as "I regret ..." and "Mostly girls ...".
As in other projective devices, it is assumed that the subject reflects his own wishes, desires, fears and attitudes in the sentences he makes.
The Incomplete Sentences Blank consists of forty items revised from a form used by Rotter and Willermann (11) in the army.
The Incomplete Sentences Blank can be used, of course, for general interpretation with a variety of subjects in much the same manner that a clinician trained in dynamic psychology uses any projective material.
The ISB has also been used in a vocational guidance center to select students requiring broader counseling than was usually given, in experimental studies of the effect of psychotherapy and in investigations of the relationship of adjustment to a variety of variables.