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Project Tightness (PT): A Complementary Topological Indicator for Explaining Project Schedule Behaviour Acebes Senovilla, Fernando Tao, Liangyan Sobrino García, Manuel Pajares Gutiérrez, Javier Network Topology 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. This project has been partially funded by the Regional Government of Castile and Leon (Spain) under the Regional Accredited Research Groups Support Program, with grant VA042G2 2026-04-21T17:30:08Z 2026-04-21T17:30:08Z 2026 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Proceedings of the PMS2026 Conference (pp. 84–87). https://uvadoc.uva.es/handle/10324/84253 84 87 Proceedings of the PMS2026 Conference. Toulouse - France spa https://pms2026.sciencesconf.org/data/book_pms2026_en.pdf Attribution-NonCommercial-NoDerivatives 4.0 Internacional info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf https://uvadoc.uva.es/bitstream/10324/84253/4/Project%20Tightness%20%28PT%29_pms2026.pdf.jpg Hispana TEXT http://creativecommons.org/licenses/by-nc-nd/4.0/ UVaDOC. Repositorio Documental de la Universidad de Valladolid https://uvadoc.uva.es/handle/10324/84253