Nachselektion

Nachselektion is a German-language term formed from nach- ("after") and Selektion ("selection") and generally denotes a subsequent or follow-up selection process applied after an initial selection event. The term is used across disciplines to describe any procedure that refines, supplements, or corrects an earlier choice of subjects, items, or candidates.

In scientific research and breeding, Nachselektion can mean applying additional selection pressure after a primary round to increase the frequency of desired traits or to remove remaining undesirable variants. In quality control and manufacturing it refers to secondary inspection stages that identify defects missed in initial screening. In human resources and admissions, Nachselektion describes follow-up selection measures such as waiting-list appointments, replacement of withdrawn candidates, or supplementary interviews to fill remaining vacancies.

Practically, Nachselektion can improve overall outcomes by allowing adjustments based on new information, but it also raises methodological and ethical considerations. Repeated selection stages may introduce bias, reduce transparency, or disadvantage groups if criteria are changed or not clearly communicated. Effective Nachselektion typically requires predefined rules, consistent application of criteria, record keeping, and oversight to ensure fairness and reproducibility.

The concept is closely related to terms such as secondary selection, post-selection, and supplementary selection. Usage and implications vary by context, so detailed practices are determined by discipline-specific standards, legal frameworks, and institutional policies.