In this paper, a theoretic framework was proposed on how to select the most appropriate creativity tools to stimulate designers' creativity in terms of the nature of the design task to be tackled, and the personality traits and preferences of the designers. This is illustrated in an engineering problem solving case study. The results were overall positive, many and diverse ideas were obtained although designers reported few challenges when using the creativity tools. The findings address the need to carefully choose creativity tools suited to designers' personality and the type of design task.