In classical planning using the Critical Path Method, the sequence of activities is defined and a master schedule is developed, often based on numerous assumptions, such as whether the work crew will complete activities within the planned timeframe, whether materials will arrive at the construction site on time and in sufficient quantities, and whether weather conditions will be suitable for execution, which can lead to delays. This approach is also used in the company Gorenjska gradbena družba d.d., where a master schedule is prepared and later updated as needed by the site manager. Lean construction represents a modern approach to the execution of construction projects, emphasizing collaboration and efficiency among stakeholders. It encourages the active involvement of all project participants with the aim of reducing delays, improving safety, meeting deadlines, and staying within the investor’s budget, while also minimizing waste. The most widely used lean construction method is the Last Planner® System (LPS), which is based on more detailed planning closer to the execution phase, involves work crews, and enables early identification and resolution of issues that may affect timely project completion. Regular weekly meetings are essential, during which the Weekly Work Plan (WWP) is prepared or updated with the active involvement of subcontractors, increasing the reliability of task execution and improving communication between teams. The advantages of lean construction include shorter construction time, fewer changes during execution, improved transparency, and cost optimization, while the disadvantages often include high initial costs, employee resistance, complexity of method integration, and the need for continuous discipline and strong management support.
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