Whereas investments in new attractions continue to rise within the theme park industry, knowledge regarding the effects of new attractions on theme park performance and attendance remains scarce. In this article results from a research amongst general managers of theme parks in Europe will be presented. Different methods were used to investigate what the impact of adding a new attraction on the number of visitors to a theme park would be, according to the general management. The managers first responded to a written survey and then answered some detailed, elaborative questions by email or telephone. The majority of managers also participated in an in-depth interview. Results show that investing in new attractions is considered to be the most important (controllable) factor on the number of visitors in both the short and long run. Most theme parks in Europe invest in major new attractions once every three years, combining it with a minor investment every year. Large differences in effects were found between parks. Parks that invest once every three years showed the highest effect on number of visitors for their latest new attraction.