The critical design review (CDR) of the ACA correlator developed by the NAOJ was held on December 6 and 7 at the MAOJ Mitaka campus, and the design was approved by the review panel including overseas experts. From now on, the correlator team will start the manufacture after completing some problems which were pointed out in the review. The photo shows the participants of the review, including reviewers from overseas (Sachiko Okumura, leader of the ACA correlator team is the one wearing red, front row fourth from right).