 He realized that in getting an education archaeologists, "... spend much of their time learning phonemics, personality and culture, esoteric kinship systems, strange customs of primitive peoples, and so forth and do not have time for fields like botany, zoology, pollen analysis, soils, and geology – all disciplines they will have to use".In order to rectify this, MacNeish began to involve experts outside of archaeology in many of his field studies.This policy was very well demonstrated in his excavations in the Tehuacan Valley and Ayacucho, Peru which resulted in multi-volume publications which analyzed the sites "utilizing the skills of all appropriate scientific fields".