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Since the end of the 50’s when CPM -Critical Path Method- and PERT -Program Evaluation and Review Technique- were developed, the evolution of the use in practice of these and other methods of project scheduling has been closely linked to the evolution of the software and hardware which has made it possible from the start. We can divide its four decades of history into three principle periods. The first until the 70’s, during which large machines, mainframes, were necessary. Therefore, project scheduling in that period was quite costly, reserving it in practice for large projects and big companies. The PC’s are the protagonists of the second period, taking place in approximately the decade of the 80’s. In 1981 the IBM PC came out and in 1983 Harvard Project Manager software appeared. Later, tens of packages for the PC flooded the market, making it possible for any company to have access to software at …