Aim: Todays orthodontist has abundant appliance alternatives for facial orthopedic growth modification and creating arch space that meet individualized patient needs and goals. This article highlights effective appliances for maxillary arch development and space gain, with an emphasis on nonextraction therapy when appropriate. Methods: Begin with the end in mind. Select and integrate appliance(s) best suited for the patients facial pattern and therapeutic requirements. Establish specific treatment goals and flow to efficiently accomplish space gains. Results: Maxillary space gains of 6 to10 mm are achieved, depending on individual facial type and arch discrepancies. Smile harmony is emphasized. Conclusion: Transverse dimension is optimized by reshaping arch form and uprighting the buccal segments. Greater posterior arch width and effective methods for structural and dentoalveolar changes are described, resulting in optimal soft tissue facial and smile features. Part II of this article will illustrate mandibular arch space-gain methods and growth modification.Orthodontic-restorative case studies and asymmetry management as it relates to the nonextraction emphasis will be included. World J Orthod 2001;2:21–32.