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00925njm 22002777a 4500 dc Acebes Senovilla, Fernando author Tao, Liangyan author Sobrino, Manuel author Pajares Gutiérrez, Javier author 2026-04 The paper introduces Project Tightness (PT) as a topological indicator that captures the temporal tension of project networks and complements the traditional Series–Parallel (SP) index. Through simulation studies, the results show that PT helps explain differences in variance propagation and control performance among projects with similar structures. Overall, combining PT and SP provides a more complete understanding of project behaviour under uncertainty. Proceedings of the PMS2026 Conference (pp. 84–87). https://uvadoc.uva.es/handle/10324/84253 84 87 Proceedings of the PMS2026 Conference. Toulouse - France Project Tightness (PT): A Complementary Topological Indicator for Explaining Project Schedule Behaviour