The need for compact, solid-state actuation systems for use in the aerospace, automotive, and other transportation industries is currently driving research in improved high temperature shape memory alloys (HTSMA) having transformation temperatures above 100°C.  One of the basic high temperature systems under investigation to fill this need is NiTiPd.  Ternary NiTiPd alloys containing 15 to 46 at.% Pd have been processed and the transformation temperatures, basic tensile properties, and work characteristics have been determined.  However, testing indicates that at higher levels of alloying addition, the benefit of increased transformation temperature begins to be offset by lowered work output and permanent deformation or “walking” of the alloy during thermal cycling under load.  In response to this dilemma, NiTiPd alloys have been further alloyed with Au, Pt, and Hf additions to solid solution strengthen the martensite and austenite phases in order to improve the thermomechanical behavior of these materials.  The tensile properties, work behavior, and dimensional stability during repeated thermal cycling under load for the ternary and quaternary alloys will be compared and discussed.  In addition, the benefits of more advanced thermomechanical processing or training on the dimensional stability of these alloys during repeated actuation will be presented.