There are many synonyms for the phrase "quality of performed work." These include effectiveness, efficiency, excellence, competence, proficiency, and skill. Each of these words conveys a sense of high-quality work that is expertly done and meets or exceeds expectations. Additional synonyms for quality of work may include precision, accuracy, attention-to-detail, mastery, and expertise. While all of these terms have slightly different meanings, they all ultimately express the same idea - that the work performed is done to a high standard and exhibits skill, care, and professionalism.