What had started in 1991 as an entity with over 1,200 personnel (the United Nations Observer Mission in El Salvador, or ONUSAL) had by May 1996 been reduced to an organization of six, called the United Nations Offices for Verification (ONUV).
In May 1996, MINUSAL gave way to ONUV. (Redaccion de Nacionales, ONU Cierra Penultimo Mecanismo de Verificacion.
For five years during the 1990s, the UN missions ONUSAL, MINUSAL, and ONUV
actively monitored these reforms, challenged the government when it failed to act in good faith, and provided extensive technical assistance to new or reforming state agencies.