The purpose of this document is to provide overall justification on how micro-aggregation generally can yield public-use files in which re-identification rates are extraordinarily high. This work provides intuition and reasoning that supplements empirical evidence suggesting that re-identification rates may be high with standard micro-aggregation (see e.g., Domingo-Ferrer and Mateo-Sanz 2001, Domingo-Ferrer et al. 2002). Much of the earlier work on micro-aggregation concentrated on the degradation of analytic properties. The earlier work typically did not contain re-identification experiments.