This much needed book provides insights as well as tools and strategies to educate agency administrators, management, and staff regarding the specific needs of clients with these environmental Illnesses (EIs) as well as what should be implemented regarding initial home safety, client safety, and needs assessments, training for staff and direct care providers, ongoing supervision and training, scheduling considerations, and more. Multiple Chemical Sensitivity (MCS) is a real, physiological environmental illness affecting growing numbers of people including veterans returning home and needing care. Understanding MCS: An Agency/Provider Guide can be used to inform all healthcare professionals as they plan the care and services they will provide for individuals suffering from the very serious chronic illnesses of MCS, mastocytosis, MCAS, chronic fatigue syndrome, fibromyalgia, and other mast cell activation spectrum related disorders.