You should check if the program provides a professional curriculum tailored to a child's developmental stage, and if it has a learning process that ensures learning effectiveness without losing a child's interest. It's also important to check if a sufficient number of physical workbooks are provided with the smart learning component. Additionally, you should verify if the learning device is specifically designed for young children (e.g., easy to operate, designed with their physical development in mind). Wink is the only program that has a patented learning device exclusively for young children, the most physical workbooks, a one-stop system that automatically recognizes and explains workbook pages, and a 'concept -> practice -> problem-solving -> review' process for all learning stages.