KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS VOL. 9, NO. 8, Aug. 2015 3216 Copyright  2015 KSII A preliminary version of this paper was presented at ICONI 2014, and was selected as an outstanding paper. This research was supported by the MSIP(Ministry of Science, ICT and Future Planning), Korea, under the “IT Consilience Creative Program” (NIPA-2014-H0201-14-1002) supervised by the NIPA(National IT Industry Promotion Agency). Also, it was partially supported by the GRRC of Gyeonggi Province. http://dx.doi.org/10.3837/tiis.2015.08.028 ISSN : 1976-7277 A GraphML-based Visualization Framework for Workflow-Performers’ Closeness Centrality Measurements Min-Joon Kim 1* , Hyun Ahn 2 , Minjae Park 3 1 Department of School of Integrated Technology, YONSEI UNIVERSITY Incheon, 406-840, South Korea [e-mail: minjoon@yonsei.ac.kr] 2 Department of Computer Science, KYONGGI UNIVERSITY Suwon, 443-760, South Korea [e-mail: hahn@kgu.ac.kr] 3 Engineering Innovation Department, R&D Center, BISTel, INC. Seoul, 137-891, South Korea [e-mail: mjpark@bistel-inc.com] *Corresponding Author: Minjae Park Received April 7, 2015; revised June 12, 2015; accepted July 8, 2015; published August 31, 2015 Abstract A hot-issued research topic in the workflow intelligence arena is the emerging topic of “workflow-supported organizational social networks.” These specialized social networks have been proposed to primarily represent the process-driven work-sharing and work-collaborating relationships among the workflow-performers fulfilling a series of workflow-related operations in a workflow-supported organization. We can discover those organizational social networks, and visualize its analysis results as organizational knowledge. In this paper, we are particularly interested in how to visualize the degrees of closeness centralities among workflow-performers by proposing a graphical representation schema based on the Graph Markup Language, which is named to ccWSSN-GraphML. Additionally, we expatiate on the functional expansion of the closeness centralization formulas so as for the visualization framework to handle a group of workflow procedures (or a workflow package) with organizational workflow-performers. Keywords: workflow-supported organizational social network (WSSN), information control net (ICN), closeness centralization measures/vector (CCV), workflow model, graph markup language (graphML), organizational knowledge management, workflow intelligence