Peierls served on the Committee 1968-1974 as Scientific Adviser. When the Committee was reorganised as a Working Group he continued to act as a consultant. As he was rarely able to attend meetings in person, he contributed several papers for committee consideration, often after consultation and assessment among scientific colleagues. Topics dealt with include the test-ban, chemical and biological warfare, gas centrifuges, the SALT treaties, operation Plowshare, etc.