Chevron pulled a fast one on us a couple years ago when they artificially inflated the PSGs to give millennials the illusion that they were getting promoted. Everyone was paid a visit by their sponsor to be told a) to millennials, 'congratulations! you got a promotion!' or b) to Boomers, 'don't worry, nothing's changed' (even though they just got a de facto PSG demotion, eliminating any chance at all of ever getting promoted again - effectively freezing their salary). The sinister thing was they introduced the concept of 'Technical Grade' (I think that's what it's called) that basically roughly parallels the PSGs, but really replaces it by introducing even wider salary and promotion bands associated with the PSGs. To answer the question? Now every job has a +/- 1PSG ring around it, so Chevron doesn't have to demote someone (i.e., lawsuit) if they move them to a lower PSG job. What it really means is that the person won't get a meaningful raise for maybe a decade or more - as was done to the Boomers since 2015.