The vacancy model sometimes referred to as a renewal or sequencing model, analyzes flows of personnel throughout the organization by examining inputs and outputs at each hierarchical or compensation level. Vacancy models have been found to have more predictive capacity than Markov models over short-time frame for this model is one year into the future. It is important that we always calculate our personnel supply requirements one level at a time in a “top-down” fashion, beginning at the highest relevant authority level, because the normal direction of personnel movement in the organization is from the bottom to the top.
Definition