He further points out that “the spurious precision of quantified staffing level plans has little value when
reconciled with the complex and frequently changing nature of man power, the business and the external
environment”. The concept of Human Resource Planning (HRP) fails because the ability to make these
estimates must be severely limited by the definitely predicting the influence of external events. “There is a risk
that sensible anticipation gets converted into foolish numbers and their validity depends on large, loose
assumptions”, according to Heller (1972).