This book constitutes the refereed proceedings of the 20th International Symposium on Knowledge and Systems Sciences, KSS 2019, held in Da Nang, Vietnam, in November 2019.The 14 revised full papers presented were carefully reviewed and selected from 31 submissions.

Estimating the Optimal Number of Clusters in Categorical Data Clustering by Silhouette Coefficient.- An Improved Two-Stage Multi-Person Pose Estimation Model.- A fuzzy AHP-TOPSIS approach for selecting the multimodal freight transportation routes.- Evolution Analysis of Newcomer-Task Network Structure of Enterprise Information System: A Case Study of a Shipbuilding Enterprise.- Online Knowledge Community Governance Based on Blockchain Token Incentives.- The Formation and Effect of Affect in Knowledge Intensive Team: A Dynamic Computational Model.- Evolutionary Analysis of Developer Collaboration Network in Cloud Foundry OSS Community.- A Model of Minority Influence in Preferenced Norm Formation.- A Knowledge Points and Cognitive Verb Labeling Strategy for Test Questions Based on Crowdsourcing Mode.- Evaluation Algorithm for the Importance of Nodes in Directed-Weighted Networks Based on Transfer Capability Matrix.- Opinion dynamics considering social comparison in online social networks.- Research on Dissemination Value of Micro-blog Information and Empirical Study.- Understanding public opinions shift of societal emergencies through microblogging streams.- Time to Liquidation of SMEs: The Predictability of Survival Models.

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