Solving the problem of project management using CPM (Critical Path Method), PERT (Program Evaluation and Review Technique) and LESS (Least Cost Estimating and Scheduling) methods. The package sets the critical path, schedule and Gantt chart. In addition, it allows you to draw a graph with marked critical activities. For more information about project management, see: Taha H. A. (2017, ISBN:978-1-292-16554-7), Konarzewska I., Jewczak M., Kucharski A. (2020, ISBN:978-83-8220-112-3), Rama Murthy P. (2007, ISBN:978-81-224-2944-2).