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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 5
2.1.1.2 In disputes before arbitral tribunal 30
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 25
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 17
2.1.5.1 Principles as "the rules of law [arbitrators]determine to be appropriate" 32
2.1.5.2 Principles as "relevant trade usages" to be taken into account in all cases by arbitrators 19
2.1.5.3 Principles as international trade custom 17
2.1.5.4 Principles as an expression of international law 24
2.1.6 Principles and arbitration ex aequo et bono 5
2.2 As terms incorporated into the contract 4
2.3 As means for interpreting and supplementing domestic law 19
2.3.1 Principles to confirm that solution provided by applicable domestic law is in conformity with international standards 113
2.3.2 Principles as means for interpreting and supplementing applicable domestic law 239
2.4 As means for interpreting and supplementing international uniform law instruments
2.4.1 Principles and CISG 58
2.4.2 Principles and other international instruments 15
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 2
2.7 As a model for national and international legislation 1
3 Principles and similar instruments (e.g.Principles of European Contract Law) 48
4 Relevant edition of Principles 4
Article 1.117 Cases
Article 1.29 Cases
Article 1.37 Cases
Article 1.41 Cases
Article 1.50 Cases
Article 1.63 Cases
Article 1.770 Cases
Article 1.830 Cases
Article 1.911 Cases
Article 1.103 Cases
Article 1.111 Cases
Article 1.121 Cases
Article 2.1.18 Cases
Article 2.1.25 Cases
Article 2.1.31 Cases
Article 2.1.41 Cases
Article 2.1.50 Cases
Article 2.1.64 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 2.1.1810 Cases
Article 2.1.195 Cases
Article 2.1.209 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 3.1.22 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 3.2.56 Cases
Article 3.2.65 Cases
Article 3.2.710 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 3.2.131 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 4.139 Cases
Article 4.215 Cases
Article 4.336 Cases
Article 4.48 Cases
Article 4.512 Cases
Article 4.619 Cases
Article 4.72 Cases
Article 4.88 Cases
Article 5.1.15 Cases
Article 5.1.212 Cases
Article 5.1.322 Cases
Article 5.1.49 Cases
Article 5.1.51 Cases
Article 5.1.61 Cases
Article 5.1.73 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 6.1.63 Cases
Article 6.1.71 Cases
Article 6.1.82 Cases
Article 6.1.95 Cases
Article 6.1.100 Cases
Article 6.1.110 Cases
Article 6.1.122 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 6.2.240 Cases
Article 6.2.330 Cases
Article 7.1.112 Cases
Article 7.1.23 Cases
Article 7.1.311 Cases
Article 7.1.43 Cases
Article 7.1.52 Cases
Article 7.1.64 Cases
Article 7.1.730 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 7.3.129 Cases
Article 7.3.26 Cases
Article 7.3.33 Cases
Article 7.3.41 Cases
Article 7.3.56 Cases
Article 7.3.69 Cases
Article 7.3.75 Cases
Article 7.4.123 Cases
Article 7.4.229 Cases
Article 7.4.337 Cases
Article 7.4.415 Cases
Article 7.4.56 Cases
Article 7.4.64 Cases
Article 7.4.710 Cases
Article 7.4.816 Cases
Article 7.4.942 Cases
Article 7.4.104 Cases
Article 7.4.111 Cases
Article 7.4.122 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 9.1.81 Cases
Article 9.1.91 Cases
Article 9.1.102 Cases
Article 9.1.110 Cases
Article 9.1.121 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 10.11 Cases
Article 10.25 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 11.2.11 Cases
Article 11.2.20 Cases
Article 11.2.30 Cases
Article 11.2.40 Cases