1. What constitutes State practice? 2. Explain the requirements of consistency and uniformity of State practice for the creation of an international custom. 3. What does the phrase opinio juris imply and how is it determined? 4. What is the importance of the concept of general customary international law? 5. discuss the Survey of the present state of the evidence of customary international law Identification of customary international law. Ways and means for making the evidence of customary international law 6. In what ways are general principles of law different from other sources of international law? 7. How widespread is the application of general principles of law by international courts and tribunals? Give examples. 8. Why decisions of international courts and arbitration tribunals are not formally considered to be sources of international law? 9. Discuss the application in international law of the following general principles of law: lex superior derogat legi inferiori; lex specialis derogat legi generali; lex posterior derogat legi priori. 10. Why international courts might need to resort to general principles of law? 11. What is the importance of the so-called 'collective doctrine' of international law (e.g. UN ILC documents)