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BSIS: Validity, Reliability, Sampling

Explain each of the following as they relate to assessment instruments used in forensics: reliability, validity, and norming sample populations.
Analyze the importance of these aspects for an instrument used in forensic assessment, using specific examples.
Describe the reliability, validity, and norming sample populations for the assessment instrument you selected.

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Issues in Measurement

When an instrument is used in measuring or evaluating subjects/cases in psychology, it is essential that the measure fulfils key scientific principles including validity, reliability and sampling norms. The measure I have studied is Beck's Suicide Intent Scale and was derived from the Beck Depression Inventory by Dr. Aaron Beck (a 21-item multiple-choice self-report inventory which measured the severity of depressions). The BSIS adaptation was designed to for immediately deployment as a self-report to individuals who have just committed self-harm for the purpose of looking at the severity of motivation/conviction of the person to commit suicide to assess the extremity of the suicide attempt. There are some suicide attempts taken without the intent of death (i.e. to get attention, cry for help, etc.) while others have no goal other than death itself. The BSIS attempts to scale suicide attempts according to their intent. A sample of the BSIS can be found here: ...

Solution Summary

The solution provides information, assistance and advise in tacking the task (see above) on Beck's Suicide Intent Scale in relation to validity, reliability and sampling (norming) of the instrument as a psychometric measure. Resources are listed for further exploration of the topic.