SLI is identified through a combination of standardized language tests, parental reports of language difficulties, and clinical judgment. Bishop (2004, 2009) and Bishop and Norbury (2008) discuss using both language test scores and parental reports to properly identify SLI in children. Tomblin et al. (1996, 1997) developed systems for diagnosing SLI in kindergarten-aged children using standardized language assessments. Cohen (1996) notes that unidentified language impairments are common in psychiatrically disturbed children.