Determining when a competency or task should be used as a selective factor is a decision that should be determined by job analysis and discussed with the hiring manager. If you want to use a selective factor, the justification for using it must be documented using form SF-39A (Request and Justification for Selective and Quality Ranking Factors), http://www.opm.gov/forms/pdf_fill/sf39A.pdf.
For more information regarding the use of selective factors, please see Chapter 5 in the Delegated Examining Operations Handbook, http://www.opm.gov/policy-data-oversight/hiring-authorities/competitive-hiring/deo_handbook.pdf.
If you have further questions regarding using selective factors, please contact us at Assessment_Information@opm.gov.
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