The method conducted for the concept analysis on EDLOS was the Walker and Avant approach.  They were able to research a way of measuring the concept empirically by identifying all concepts used.  (Andersson et al., 2020) Nurses can use the Walker and Avant approach when there are limited concepts available to a nurse to explain a problem area.  The process of concept analysis for nurses first transpired in 1986. (McEwen & Wills, 2019) Walker and Avant specifically designed an approach to concept analysis to help graduate nurses explain methods to examine phenomena that interests them.  (McEwen & Wills, 2019) The basic concept analysis approach by Walker and Avant is as follows; 1.  Select a concept  2. Determine the aims or purposes of the analysis.  3.  Identify all the concept possible uses possible.  4.  Determine the defining attributes.  5.  Identify the model case.  6.  Identify any borderline, related contrary, invent, and illegitimate cases.  7.  Identify the antecedents and consequences.  8.  Define the empirical referents. (McEwen & Wills, 2019, Tables 3-2)