There are various product design processes, and many focus on different aspects. One example formulation/model of the process is described by Don Koberg and Jim Bagnellin, in “The Seven Universal Stages of Creative Problem-Solving. ” The process is usually completed by a group of people with different skills and training—e. g. industrial designers, field experts (prospective users), engineers (for engineering design aspects), depending upon the nature and type of product involved. The process often involves figuring out what is required, brainstorming possible ideas, creating mock prototypes, and then generating the product. However, that is not the end. Product designers would still need to execute the idea, making it into an actual product and evaluating its success (seeing if any improvements are necessary).