What kinds of arbitrators exist and how are they classified?

In domestic law, a distinction can be made between the arbitrator of law, arbitrator ex aequo et bono and the arbitrator Arbitrator-At-Law with Regards to the Substance of the Dispute and Ex Aequo Et Bono with Regards to the Procedure.

The arbitrator of law issues his/her verdict, in accordance with the law and his/her best knowledge dictates, both in the processing and in the pronouncement of the final verdict, to the rules established for ordinary judges, according to the nature of the action deduced.

The arbitrator ex aequo et bono issues his/her verdict according to what his prudence and fairness dictate, and will not be obliged to keep in his/her procedures and in his/her ruling other rules than those that the parties have expressed in the constitutive act of the commitment, and if these would have nothing expressed, to those established in this case in the Civil Procedure Code.

The Arbitrator-At-Law with Regards to the Substance of the Dispute and Ex Aequo Et Bono with Regards to the Procedure is the one who has the powers of arbitrator regarding the procedure and the law regarding the decision, limiting himself/herself to the strict application of the law in pronouncing the final judgment.