Educational advancement in the field of psoriatic arthritis which this book will provide is consistent with GRAPPA aims and objectives leading to a productive synergy. GRAPPA (Group for Research and Assessment of Psoriasis and Psoriatic Arthritis), is recognized world wide as the leading international society for the study and promotion of awareness of psoriatic arthritis. GRAPPA is an association of leading rheumatologists, dermatologists, representatives of patient service leagues and other stakeholders focused on psoriasis and PsA.​Psoriatic Arthritis (PsA) ranks with rheumatoid arthritis and axial spondyloarthritis as one of the most prevalent inflammatory arthropathies worldwide. There is now a significant global awareness among Rheumatologists, Dermatologists, Internal Medicine Specialists, Gastroenterologists, General Practitioners, Family Practitioners, Physiotherapists, Nurse Specialists, Immunogenetics and many other Health Care Professionals with regards to the importance of psoriatic arthritis.