In commemoration of the 55th Anniversary of the Census and Statistics Department (C&SD) and the 45th Anniversary of the Hong Kong Statistical Society (HKSS), a seminar was jointly organised by C&SD and HKSS on 11 Nov 2022. The theme of the seminar was “Perspectives on Uncertainty and Error of Statistics”, with three presentations by Prof. Ian Mckeague of City University of Hong Kong, Prof. Tarani Chandola of the University of Hong Kong and young professional staff of C&SD respectively. The seminar provided a valuable opportunity for professionals in the field of statistics to share their expertise and insights on various topics related to census and survey data.