Software development Software packages available on the market not always respond to the needs of a specific industrial set up. ESAin, thanks to the experience gradually built up in more than fifteen years of activity as a software house and system integrator is capable of tailoring the solution best fitting the specific needs of any customer. What said is valid not only as far as the plant design is concerned but in general for all the industrial sectors. As an example some of the most significant customized solutions developed by ESAin in the course of the years are cited below. System for the tridimensional modelling of steam ducts and trestles of geothermal power stations for Enel SpA (http://www.enel.it/progettogeotermia) System for the dimensioning of refrigeration systems and the drawing up layout for Arneg SpA (http://www.arneg.it) Customized PDM for Varian SpA (http://www.varianinc.com)