By GPPB definition,

Where Goods, Infrastructure Projects and Consulting Services can be contracted to a particular supplier, contractor, or consultant as determined by the HOPE, for any of the following reasons:
i. The requirement is for:
a) Work of art; commissioned work or services of an artist for specific artistic skills (e.g., singer, performer, poet, writer, painter, sculptor, etc.);
b) Scientific, academic, scholarly work or research, or legal services;
c) Highly-specialized life-saving medical equipment, as certified by the Department of Health;
d) Scientific, technical, economic, business, trade or legal journal, magazine, paper, subscription, or other exclusive statistical publications and references; or
e) Media documentation, advertisement, or announcement through television, radio, newspaper, internet, and other communication media.

Due to the nature of the information to be disseminated, alongside principles of transparency, efficiency and economy, award to more than one (1) supplier may be made by the Procuring Entity.

ii. The construction or installation of an infrastructure facility where the material, equipment, or technology under a proprietary right can only be obtained from the same contractor. To justify the need to procure through this negotiated modality, the End-User shall conduct a market study and determine the probable sources. This study should confirm that the supplier, contractor or consultant could undertake the project at more advantageous terms. In all cases, the market study must be conducted prior to the commencement of the procurement process.

Government Procurement Policy Board [GPPB]. (2021 March 31). “6. Scientific, Scholarly or Artistic Work, Exclusive Technology and Media Services” under “D. Negotiated Procurement”, “V. Specific Guidelines” of “Annex H. Consolidated Guidelines for the Alternative Methods of Procurement”. In the 2016 Revised Implementing Rules and Regulations of Republic Act No. 9184 (updated as of 31 March 2021)”. Retrieved from https://www.gppb.gov.ph/assets/pdfs/Updated%202016%20IRR_31%20March%202021.pdf

https://drive.google.com/drive/folders/1s6Uz7MQXoLpyLphGeQYD0vFD68saB5QK?usp=sharing