| Preface | 5 |
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| Chapter | 7 |
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| Abbreviations and Terminology | 15 |
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| 1. Introduction | 19 |
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| 1.1 Article 80 and the Goal of Uniformity | 20 |
| 1.2 Purpose and Relevance | 22 |
| 1.3 Delimitation | 24 |
| 1.4 Outline of Presentation | 24 |
| 2. Methodology Considerations | 27 |
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| 2.1 The General Rules of Interpretation | 27 |
| 2.1.1 Application as Customary Law | 28 |
| 2.1.2 Relevance of State to State Regulation | 29 |
| 2.1.3 Purpose and Political Nature of the CISG | 31 |
| 2.2 The Specific Rule of Autonomous Interpretation | 35 |
| 2.2.1 Considering the International Character of CISG | 37 |
| 2.2.2 Promoting Uniform Application | 40 |
| 2.2.2.1 Accessibility of Case Law | 43 |
| 2.2.2.2 Scholarly Works | 44 |
| 2.2.3 Interpreting in Good Faith | 45 |
| 2.3 Litteral Interpretation as the Starting Point | 48 |
| 2.3.1 Discrepancies Between the Convention Texts | 50 |
| 2.4 Supplementing the Convention Text | 53 |
| 2.4.1 How to Identify Underlying Principles | 54 |
| 2.4.2 Implications of Having Identified Underlying Principles | 56 |
| 2.4.2.1 Expansion of Scope of the CISG | 56 |
| 2.4.2.2 Expansion of Interpretation Aids | 57 |
| 2.5 The Use of Soft Law as Interpretation Aid | 58 |
| 2.5.1 Sources of Lex Mercatoria | 60 |
| 2.5.2 Value of Soft Law and Interpretation Aid | 63 |
| 2.5.3 Temporal Issue | 64 |
| 2.5.4 Limits to the Use of Soft Law | 65 |
| 2.6 Sources Superseding the Convention Text | 66 |
| 2.6.1 The Unequivocal Agreement by the Parties | 66 |
| 2.6.2 Interpretation of the Parties’ Agreement | 67 |
| 2.6.3 Relevance of Practice and Usages | 70 |
| 2.7 The Methodology and Sources Summarised | 73 |
| 3. Development | 77 |
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| 3.1 ULIS and ULF | 78 |
| 3.2 The Drafting of CISG and Article 80 | 80 |
| 3.2.1 Wording and Placement | 81 |
| 3.2.2 Motivation to Maximise Adoption | 84 |
| 3.2.3 A Last-Minute Inclusion | 85 |
| 3.2.4 An Expression of an Underlying Principle | 86 |
| 3.2.5 Broad Interpretation Appropriate | 87 |
| 3.3 Developments Compared to the Pre-CISG Rule | 88 |
| 3.4 Latest Developments in Other Instruments | 91 |
| 3.5 Concluding Argument | 93 |
| 4. Comparison to Other Provisions | 95 |
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| 4.1 A Unique Concept of Contribution to Failure to Perform | 95 |
| 4.1.1 Systematic Context | 96 |
| 4.1.2 The Cause of the Detriment | 97 |
| 4.1.2.1 Impediments Beyond Control | 98 |
| 4.1.2.2 Mitigation of Loss | 99 |
| 4.1.2.3 The Promisee’s Contribution to Promisor’s Non-Performance | 100 |
| 4.1.3 Foreseeability and Duty to Avoid/Overcome the Cause of Detriment | 103 |
| 4.1.3.1 Strict Conditions under Article 79 | 104 |
| 4.1.3.2 Less Strict Conditions under Article 77 | 105 |
| 4.1.3.3 Lowest Restriction under Article 80 | 106 |
| 4.1.4 Burden of Proof | 108 |
| 4.1.5 Duty to Give Notice | 110 |
| 4.1.6 Remedies Affected | 111 |
| 4.2 A Supplementary Rule | 112 |
| 4.2.1 Conformity, Article 35 | 113 |
| 4.2.2 Price Reduction, Article 50 | 117 |
| 4.2.3 Third Party Rights, Article 42 | 118 |
| 4.3 Lex Specialis | 120 |
| 4.4 Concluding Argument | 121 |
| 5. Underlying Principles and Good Faith | 125 |
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| 5.1 Principles Underlying Article 80 | 127 |
| 5.1.1 Positively Phrased Duties | 128 |
| 5.1.2 Negatively Phrased Duties | 131 |
| 5.2 A General Duty of Good Faith and Fair Dealing | 134 |
| 5.2.1 Article 80’s Connection to Good Faith | 137 |
| 5.2.2 Controversy During the Drafting | 140 |
| 5.2.2.1 Arguments Contrary to a General Duty | 141 |
| 5.2.2.2 Arguments in Favour of a General Duty | 142 |
| 5.2.2.3 Subsequent Development | 143 |
| 5.2.2.4 Common Law Development | 145 |
| 5.2.2.5 A Common Core | 149 |
| 5.3 Article 80 as a Solution to the Dangers of Good Faith | 151 |
| 5.3.1 Definition and Dangers of Good Faith | 152 |
| 5.3.2 Overlap in Application of Article 80, Underlying Principles and Good Faith | 155 |
| 5.4 Concluding Argument | 159 |
| 6. Conditions for Exemption | 161 |
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| 6.1 Non-performance by the Promisor | 161 |
| 6.1.1 Non-performance Imputable to Both Parties | 163 |
| 6.1.2 Suspension of Performance as Breach of Contract | 164 |
| 6.2 Causal Link to the Promisee | 165 |
| 6.2.1 Sole Causation and Competing Causes | 165 |
| 6.2.1.1 Promisee’s Sole Interference | 166 |
| 6.2.1.2 Mixed Causation | 168 |
| 6.2.1.3 Shared Responsibility | 170 |
| 6.2.2 Requirements to the Strength of the Causal Link | 175 |
| 6.3 Act or Omission by the Promisee | 180 |
| 6.3.1 Direct Interference and Breach of Duties | 181 |