This collection explores advancements in grey prediction models and Grey Relational Analysis (GRA) through a selection of papers presented at the 2013 International Conference on Grey Systems and Intelligent Services and original submissions to Grey Systems: Theory and Application. The issue focuses on the practical applications of these grey system theories, covering topics such as grey prediction models, grey relational analysis, grey clustering, grey evaluation, and grey decision-making models. It aims to provide a forum for researchers to exchange knowledge and ideas in these specialized areas of grey system theory. The selected papers contribute to the understanding and application of GRA and grey forecasting techniques.

This collection is presented as a special issue of Grey Systems: Theory and Application, focusing on GRA and grey prediction models. The content is derived from a significant international conference and original submissions, suggesting a focus on current research and practical applications within the field of grey systems. The selection of papers was curated by the editor-in-chief of the journal, indicating a level of academic rigor and relevance to the field. The issue is intended for researchers and practitioners interested in advanced forecasting and analytical methods.