State about the lengthy administration of test battery

The lengthy administration of test battery may be unsuitable for some individuals (such as demented or psychiatric patients) who simply do not have the requisite attention span. In such instances a customised battery may be more appropriate. Such assessments typically still include some overall index of intelligence: the comprehensively norm-referenced WAIS-R (the revised Wechsler Adult Intelligence Scale; Wechsler, 1981) is commonly used. In addition, specific measures may be adopted to test particular hypotheses about an individual