To conduct the literature review on uses of TNA, the authors used the systematic search comprising four stages: selection of appropriate search terms such as training, needs assessment, needs analysis, training needs assessment, and training needs analysis; carrying out search in established databases such as EBSCOhost, Emerald, JSTOR, SpringerLink, and Wiley-Blackwell; initial sample filtering (relevance-based); and further sample filtering (access-based).