Job security has worried organizations in recent years. Different substrata of society have different perceptions about job security. This document explores the reliability and validity of an instrument that measures job security in a public institution in central Mexico by reviewing seven dimensions: territorial, national, public, human, public (self-protection), private and internet. Consequently, fit and residual values ⌠χ2 = 135.34 (32df) p = 0.054; GFI = 0.995; CFI = 0.990; RMSEA = 0.003⌡allowed us to accept the null hypothesis of a significant relationship between the theoretical dimensions with respect to the weighted factors.