This volume contains the post-proceedings of the Fourteenth and the Fifteenth International Workshops on Graph Computation Models (GCM 2023 and 2024). The workshops took place in Leicester, UK on 18th July 2023 and Enschede, the Netherlands on 9th July 2024, in each case as part of STAF (Software Technologies: Applications and Foundations). Graphs are common mathematical structures that are visual and intuitive. They constitute a natural and seamless way for system modeling in science, engineering, and beyond, including computer science, biology, and business process modeling. Graph computation models constitute a class of very high-level models where graphs are first-class citizens. The aim of the International GCM Workshop series is to bring together researchers interested in all aspects of computation models based on graphs and graph transformation. It promotes the cross-fertilizing exchange of ideas and experiences among senior and young researchers from the different communities interested in the foundations, applications, and implementations of graph computation models and related areas.

翻译：本卷收录了第十四届与第十五届国际图计算模型研讨会（GCM 2023 与 GCM 2024）的会后论文集。研讨会分别于2023年7月18日在英国莱斯特和2024年7月9日在荷兰恩斯赫德举行，两次会议均作为STAF（软件技术：应用与基础）系列活动的一部分。图是一种直观可视的常见数学结构，为包括计算机科学、生物学和业务流程建模在内的科学、工程及其他领域的系统建模提供了一种自然且无缝的方式。图计算模型是一类以图为一等公民的极高层次模型。国际GCM研讨会系列旨在汇聚对基于图与图变换的计算模型各方面感兴趣的研究人员，促进来自图计算模型及相关领域的基础、应用与实现研究的不同学术群体的资深学者与青年学者之间进行思想与经验的交叉融合与交流。