Professionalism Members and staff are required to approach each task in a professional manner, with the required knowledge, diligence and competence. Consistency The commission/mission should examine and analyse each piece of information it receives, irrespective of the source. It should continue this process until it has completed a thorough and comprehensive inquiry, all possible sources of information have been explored and it has obtained a clear understanding of the situation under investigation. The international standards, principles and guidance on methods of work can be found in international human rights treaties, United Nations declarations and principles, and United Nations manuals and guidelines (see annex I). GUIDANCE AND PRACTICE 35