Principles of Knowledge Representation and Reasoning, Incorporated (KR, Inc.) is a not for profit Scientific Foundation incorporated in the state of Massachusetts of the United States of America, concerned with fostering research and communication on knowledge representation and reasoning.

Its primary activities include organizing a series of prestigious conferences, the conferences on Principles of Knowledge Representation and Reasoning, cooperating with workshops on related topics, maintaining informational materials on the World Wide Web, and maintaining KR-related mailing lists.

Due to the COVID19 pandemic, KR2020 (originally planned to be held in Rhodes, Greece), was held vitually and had a record number of participants.

The 18th International Conference on Principles of Knowledge Representation and Reasoning (KR2021), will be held in Hanoi, Vietnam, tentatively in November 5-11, 2021.

The General Chair of KR2021 is Esra Erdem; the Program Chairs are Meghyn Bienvenu and Gerhard Lakemeyer; the Local Arrangements Chairs are Giuseppe De Giacomo, Tran Cao Son, Long Tran-Thanh, and Thanh Van Dinh.

We look forward to welcoming you to Hanoi in 2021!