Companies determine if TV advertising works through various methods. They set clear goals before launching campaigns. Analyzing sales data before and after the ads shows direct impact. Surveys and customer feedback help gauge audience awareness. Tracking website traffic can reveal increases after ad airings. Companies often use unique codes or phone numbers to measure responses. Ratings and viewership data provide insights into audience reach. Comparing costs to revenue generated calculates return on investment. Market research assesses changes in brand perception. These methods help companies evaluate the effectiveness of their TV advertising efforts and make informed decisions for future campaigns.