This thesis deals with public procurement law in the Czech Republic. It captures the latest trends in public procurement law, together with the amendment to the Public Procurement Act, which entered into force on 1 April 2012. The opening chapter introduces the concepts that are closely related to the issue of public procurement and corruption. There are explained key institutional control mechanisms in the Czech Republic and criminal liability of corruption. The analytical part of this thesis describes the changes, which the amendment brought into the Public Procurement Law. These changes are mainly assessed in terms of impact on the suppression of corruption. This thesis presents and analyzes the arguments of proponents and opponents of the amendment. The analysis is accompanied by a brief look at the development of legislation on public procurement in the European Union in general and in two selected countries of the European Union. The conclusion contains a summary assessment of the issue along with an outlook for a possible further developments in the legal regulation of public procurement. Based on the analysis, the thesis leads to the conclusion that the amendment of public contracts, despite some shortcomings, is leading to a more transparent procurement environment.

The present article has as principal goal to analyze and comment the more relevant aspects referred to the amendments on that can be done to a contract, in the terms allowed by the new Public Procurement Peruvian Law. Also, the author will refer to the opinions emitted by the OSCE about the topic. Finally, he will state his main conclusions. / El presente artículo tiene como objetivo principal, analizar y comentar los más importantes aspectos referidos al tema de las modificaciones que se pueden realizar al Contrato, en los términos expuestos en la Ley de Contrataciones del Estado – Ley Nº 30225. Asimismo, procederemos a citar opiniones del OSCE referentes al tema; finalizando con la exposición de nuestras conclusiones.