Psychologists' codes of ethics are constructed in dialogue. Through responsive and deliberative dialogues, concerns and aspirations have been articulated into the ethical principles and standards that psychologists adopt for their professional self-regulation. This article traces how such dialogues featured in developing the earliest, through to the present, Canadian Code of Ethics for Psychologists. The history of these dialogues shows psychologists responding to emerging concerns with ethical standards, and sometimes revisions to them, relevant to their practice. The experiences of two participants at the center of these dialogues are recounted, as are their present efforts to extend discussions of ethical principles into the international arena. Constructivist psychologists are encouraged to join the ongoing dialogues on ethics that shape their practice.