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These Principles set forth general rules for international commercial contracts.
They shall be applied when the parties have agreed that their contract be governed by them.
They may be applied when the parties have agreed that their contract be governed by general principles of law, the lex mercatoria or the like.
They may be applied when the parties have not chosen any law to govern their contract.
They may be used to interpret or supplement international uniform law instruments.
They may be used to interpret or supplement domestic law.
They may serve as a model for national and international legislators.

Number Issue # Cases
1 Material scope of application of Principles
1.1 International commercial contracts 1
1.1.1 Contracts v. unilateral acts
1.1.2 International v. domestic contracts 3
1.1.3 Commercial v. consumer transactions
2 Applicability of Principles
2.1 As rules of law governing the contract
2.1.1 Principles applicable if expressly chosen by the parties
2.1.1.1 In disputes before State court 4
2.1.1.2 In disputes before arbitral tribunal 26
2.1.2 Principles as expression of the "lex mercatoria" referred to in the contract 8
2.1.3 Principles as expression of "general principles of law" referred to in the contract 24
2.1.4 Principles as an expression of lex sportiva 1
2.1.5 Principles applied in the absence of any choice-of-law clause 10
2.1.5.1 Principles as "the rules of law [arbitrators]determine to be appropriate" 28
2.1.5.2 Principles as "relevant trade usages" to be taken into account in all cases by arbitrators 18
2.1.5.3 Principles as international trade custom 13
2.1.5.4 Principles as an expression of international law 19
2.1.6 Principles and arbitration ex aequo et bono 4
2.2 As terms incorporated into the contract 4
2.3 As means for interpreting and supplementing domestic law 15
2.3.1 Principles to confirm that solution provided by applicable domestic law is in conformity with international standards 102
2.3.2 Principles as means for interpreting and supplementing applicable domestic law 213
2.4 As means for interpreting and supplementing international uniform law instruments
2.4.1 Principles and CISG 49
2.4.2 Principles and other international instruments 13
2.5 As guide for drafting contracts 1
2.5.1 Principles as model contract clauses 1
2.5.2 Principles as a check-list
2.5.3 Principles as lingua franca
2.6 As means for interpreting international contracts 1
2.7 As a model for national and international legislation
3 Principles and similar instruments (e.g.Principles of European Contract Law) 46
4 Relevant edition of Principles 4
Article 1.117 Cases
Article 1.27 Cases
Article 1.36 Cases
Article 1.41 Cases
Article 1.50 Cases
Article 1.63 Cases
Article 1.761 Cases
Article 1.821 Cases
Article 1.910 Cases
Article 1.102 Cases
Article 1.110 Cases
Article 1.121 Cases
Article 2.1.17 Cases
Article 2.1.25 Cases
Article 2.1.30 Cases
Article 2.1.41 Cases
Article 2.1.50 Cases
Article 2.1.63 Cases
Article 2.1.70 Cases
Article 2.1.80 Cases
Article 2.1.90 Cases
Article 2.1.100 Cases
Article 2.1.116 Cases
Article 2.1.123 Cases
Article 2.1.134 Cases
Article 2.1.144 Cases
Article 2.1.1510 Cases
Article 2.1.162 Cases
Article 2.1.176 Cases
Article 2.1.187 Cases
Article 2.1.194 Cases
Article 2.1.208 Cases
Article 2.1.216 Cases
Article 2.1.221 Cases
Article 2.2.10 Cases
Article 2.2.20 Cases
Article 2.2.30 Cases
Article 2.2.40 Cases
Article 2.2.51 Cases
Article 2.2.60 Cases
Article 2.2.70 Cases
Article 2.2.80 Cases
Article 2.2.90 Cases
Article 2.2.101 Cases
Article 3.1.10 Cases
Article 3.1.21 Cases
Article 3.1.32 Cases
Article 3.1.41 Cases
Article 3.2.12 Cases
Article 3.2.25 Cases
Article 3.2.30 Cases
Article 3.2.40 Cases
Article 3.2.55 Cases
Article 3.2.63 Cases
Article 3.2.78 Cases
Article 3.2.82 Cases
Article 3.2.92 Cases
Article 3.2.100 Cases
Article 3.2.111 Cases
Article 3.2.122 Cases
Article 3.2.130 Cases
Article 3.2.140 Cases
Article 3.2.150 Cases
Article 3.2.160 Cases
Article 3.2.170 Cases
Article 3.3.10 Cases
Article 3.3.22 Cases
Article 4.137 Cases
Article 4.215 Cases
Article 4.333 Cases
Article 4.46 Cases
Article 4.510 Cases
Article 4.617 Cases
Article 4.72 Cases
Article 4.87 Cases
Article 5.1.13 Cases
Article 5.1.29 Cases
Article 5.1.321 Cases
Article 5.1.49 Cases
Article 5.1.50 Cases
Article 5.1.60 Cases
Article 5.1.72 Cases
Article 5.1.84 Cases
Article 5.1.90 Cases
Article 5.2.10 Cases
Article 5.2.20 Cases
Article 5.2.30 Cases
Article 5.2.40 Cases
Article 5.2.50 Cases
Article 5.2.60 Cases
Article 5.3.10 Cases
Article 5.3.20 Cases
Article 5.3.30 Cases
Article 5.3.40 Cases
Article 5.3.50 Cases
Article 6.1.10 Cases
Article 6.1.20 Cases
Article 6.1.30 Cases
Article 6.1.42 Cases
Article 6.1.50 Cases
Article 6.1.62 Cases
Article 6.1.71 Cases
Article 6.1.82 Cases
Article 6.1.94 Cases
Article 6.1.100 Cases
Article 6.1.110 Cases
Article 6.1.121 Cases
Article 6.1.131 Cases
Article 6.1.142 Cases
Article 6.1.153 Cases
Article 6.1.161 Cases
Article 6.1.171 Cases
Article 6.2.110 Cases
Article 6.2.238 Cases
Article 6.2.330 Cases
Article 7.1.17 Cases
Article 7.1.22 Cases
Article 7.1.35 Cases
Article 7.1.43 Cases
Article 7.1.52 Cases
Article 7.1.64 Cases
Article 7.1.731 Cases
Article 7.2.13 Cases
Article 7.2.25 Cases
Article 7.2.30 Cases
Article 7.2.40 Cases
Article 7.2.51 Cases
Article 7.3.128 Cases
Article 7.3.26 Cases
Article 7.3.33 Cases
Article 7.3.40 Cases
Article 7.3.54 Cases
Article 7.3.68 Cases
Article 7.3.74 Cases
Article 7.4.119 Cases
Article 7.4.224 Cases
Article 7.4.331 Cases
Article 7.4.412 Cases
Article 7.4.55 Cases
Article 7.4.64 Cases
Article 7.4.710 Cases
Article 7.4.814 Cases
Article 7.4.937 Cases
Article 7.4.103 Cases
Article 7.4.110 Cases
Article 7.4.121 Cases
Article 7.4.1312 Cases
Article 8.10 Cases
Article 8.20 Cases
Article 8.30 Cases
Article 8.40 Cases
Article 8.50 Cases
Article 9.1.10 Cases
Article 9.1.20 Cases
Article 9.1.30 Cases
Article 9.1.41 Cases
Article 9.1.51 Cases
Article 9.1.60 Cases
Article 9.1.70 Cases
Article 9.1.80 Cases
Article 9.1.90 Cases
Article 9.1.101 Cases
Article 9.1.110 Cases
Article 9.1.120 Cases
Article 9.1.131 Cases
Article 9.1.140 Cases
Article 9.1.150 Cases
Article 9.2.12 Cases
Article 9.2.20 Cases
Article 9.2.31 Cases
Article 9.2.40 Cases
Article 9.2.52 Cases
Article 9.2.60 Cases
Article 9.2.70 Cases
Article 9.2.80 Cases
Article 9.3.10 Cases
Article 9.3.20 Cases
Article 9.3.32 Cases
Article 9.3.42 Cases
Article 9.3.50 Cases
Article 9.3.60 Cases
Article 9.3.70 Cases
Article 10.10 Cases
Article 10.24 Cases
Article 10.30 Cases
Article 10.41 Cases
Article 10.50 Cases
Article 10.61 Cases
Article 10.70 Cases
Article 10.80 Cases
Article 10.92 Cases
Article 10.100 Cases
Article 10.110 Cases
Article 11.1.12 Cases
Article 11.1.20 Cases
Article 11.1.32 Cases
Article 11.1.40 Cases
Article 11.1.50 Cases
Article 11.1.60 Cases
Article 11.1.70 Cases
Article 11.1.80 Cases
Article 11.1.90 Cases
Article 11.1.100 Cases
Article 11.1.110 Cases
Article 11.1.120 Cases
Article 11.1.130 Cases
Article 11.2.10 Cases
Article 11.2.20 Cases
Article 11.2.30 Cases
Article 11.2.40 Cases