The process of time-planning project activities is extremely important in construction projects because it creates the initial dynamic plan for the performance of various buildings. Planning is included in all the main phases of the project life cycle, i.e., conception, definition, execution, and use. In this thesis, a brief overview of the theoretical bases for planning is given, and, based on the available bases, a case study of the construction project of a reinforced concrete multi-story building with the use of modular formwork at the Svetog Petka 2A location in Osijek is made. In addition to the advantages mentioned above, planning techniques, methods of displaying output data, and connections between activities are also described. In the theoretical part, the process of creating the initial dynamic plan is described. The case study is based on the completed project of a reinforced concrete apartment building using modular formwork. Based on the given background, an initial dynamic plan was created within the case study. A detailed technical description of the building was written as part of the study. The case study covers the steps of creating an initial dynamic plan. After the technical description, the project is broken down into smaller manageable units (WBS), down to the activity level. Calculated quantities of formwork, concrete, reinforcement, and walls are attached to defined activities in the time plan. The duration of the activities is determined by the allocated budget effects and time norms. The activities are connected to the dynamic plan as a whole through connections. Related activities are assigned resources. The output data for the total duration of the project are presented in the form of a Ganttogram, and the availability of resources is presented in the form of the accompanying histogram method.