AD 1100 and 1400

Sce:dagĭ Mu:val Va’aki, in Mesa, Arizona, preserves a group of Hohokam structures constructed during the Classic Period. The ruins were occupied between AD 1100 and 1400 and were a product of the Hohokam civilization that inhabited the Salt River Valley. There the Hohokam constructed an extensive system of water canals. It is one of only two Hohokam mounds remaining in the metro Phoenix area, with the other being the Pueblo Grande Museum Archaeological Park. The site's central feature is a massive ruin of adobe walls and platforms.

The Picture Exchange Communication System (PECS) is an augmentative and alternative communication system developed and produced by Pyramid Educational Consultants, Inc. PECS was developed in 1985 at the Delaware Autism Program by Andy Bondy, PhD, and Lori Frost, MS, CCC-SLP. The developers of PECS noticed that traditional communication techniques, including speech imitation, sign language, and picture point systems, relied on the teacher to initiate social interactions and none focused on teaching students to initiate interactions. Based on these observations, Bondy and Frost created a functional means of communication for individuals with a variety of communication challenges. Although PECS was originally developed for young children with autism spectrum disorder (ASD), its use has become much more widespread. Through the years, PECS has been successfully implemented with individuals with varying diagnoses and of varying ages. PECS is an evidence-based practice that has been highly successful with regard to the development of functional communication skills.