the first villages were established and its settlers practiced season agriculture, used runoff water from the mountains. The period subdivides in: Convent Phase. Pilón Phase. During the above phases started the construction of circular homes, built by excavating a circle of less than a meter deep, which served as a base, such housing area were approximately 10 m2 and the door round, in the middle of the village stood a community housing larger than the family homes. Perros Bravos Phase. During this phase increased the size of houses, began building next to each other and the base ceased to be circular by adapting a square shape. Decorated pottery was present in this period, also appear pieces of shell necklaces, small turquoise beads and copper. Stage IV Medium period. Finished in 1400 CE. The social organization and city appearance was transformed. The period is subdivided in: Buena Fe Phase. Houses are single story and doors are T-shaped and roofs are beam supported. Paquimé Phase. The culture reaches its greatest splendor, trade relations with other populations increase and ceremonial structures are built. The city is crossed by an irrigation system of channels that provide water, built a ballgame court and began construction of multi-story houses; some constructions had up to four levels. Diablo Phase. The city was partially abandoned. Decline began due to attacks from enemy peoples. Towards 1340 CE, the population fell to enemies and many inhabitants were killed: this is concluded from the large amounts of human remains found in grotesque postures. Stage V Late period. From 1340 to 1660 CE. This period is subdivided in: Robles Phase. First sporadic Spaniards contact Phase. Stage VI Spaniards period. From 1660 to 1821 CE. Constructive characteristics T Doors T shaped doors. In adobe walls; wider on top and narrower below, small height, barely one meter. According to a theory, the door shape is associated to the prehistoric "cachinas" (ancestors spirits), represented in the United States southwest. Walls Construction by a box system. Used molds to pour mud without organic material, compacted. The exterior was stuccoed with sand, lime and oyster dust shells, then it was painted blue, green and pink. Without foundation; the walls were built from slots 25 cm deep. For several levels, the walls below were wider, up to 1.40 m, and 50 cm at higher levels. Furnaces and ventilation Used to control interior temperature. Ventilation was made in the