The engineering task – to improve the existing solution starts when, during the cycles of manufacturing or intended use of a technical system, it appeared preconditions for achieving better results. Although the problem is common for the engineering practice, there is no generally accepted model (algorithm) for its solution. For the harvesting of soy crops and other row crops in the country headers HPS are widely used, which are manufactured at METAREM – AD Pavlikeni. For the past more than thirty years since the start of mass production, headers passed their long path of development and improvement. Through the analysis of the collaboration of TISEM – AD, Ruse and METAREM – AD in the improvement of headers HPS, the types of activities and the content of the work are clarified. On this basis, is proposed a model (algorithm) to solve the engineering task to improve the existing solution, which covers all the activities of the design process.