Final answer:
Julie fails to take full advantage of a basic principle in Positive Psychology in the Workplace by withholding praise for accomplishments and calling attention to mistakes.
Step-by-step explanation:
Julie fails to take full advantage of a basic principle in Positive Psychology in the Workplace. Positive psychology in the workplace focuses on enhancing the well-being and strengths of employees, including recognizing and appreciating their accomplishments. By withholding praise and focusing on mistakes, Julie is not effectively utilizing this principle.