RT info:eu-repo/semantics/article T1 Project Tightness (PT): A Complementary Topological Indicator for Explaining Project Schedule Behaviour A1 Acebes Senovilla, Fernando A1 Tao, Liangyan A1 Sobrino García, Manuel A1 Pajares Gutiérrez, Javier K1 Network Topology AB 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. YR 2026 FD 2026 LK https://uvadoc.uva.es/handle/10324/84253 UL https://uvadoc.uva.es/handle/10324/84253 LA spa NO Proceedings of the PMS2026 Conference (pp. 84–87). DS UVaDOC RD 28-abr-2026