The Regulations for Official Doctoral Studies at the University of La Laguna describe in Article 10, points 3 and 4, the activities planned to promote supervision or co-supervision, in those cases academically justified, for the development of the program. Thus, the thesis may have another supervisor, who must meet the same requirements established for a thesis supervisor in that doctoral program, when there are academic reasons, such as thematic interdisciplinarity or programs developed in national or international collaboration, with prior authorization from the Academic Committee. Likewise, a new researcher or a professor or researcher with a minimum of research experience who does not meet the requirements established for a thesis supervisor may assume the duties of co-supervisor. In all cases, they must have a civil service or contractual relationship with the university or organization collaborating in the development of the program.

Traditionally, faculty involvement in thesis supervision in the Chemistry and Chemical Engineering departments at the University of La Laguna has been very high. A large majority of faculty in these departments have committed to the doctoral program and have expressed interest in supervising doctoral theses. Supervisors are increasingly offering more opportunities than they are demanding from potential doctoral students, although the number of these candidates has remained stable or even increased in recent years.

However, in order to encourage the completion of higher-quality theses with more transversal content, periodic information and coordination meetings have been planned for potential program directors. The objective is to keep potential directors informed of regulatory changes, opportunities to complete co-supervised theses or theses with international accreditation, etc.

These meetings will be organized by both the Doctoral School and the Academic Committee of the Program.

Furthermore, supervisory work is encouraged through its recognition in teaching assignments within the regulations of the Model for Estimating Teaching Assignment in the Areas of the New Undergraduate and Postgraduate Degrees at the University of La Laguna. This regulation establishes a reduction in teaching load of up to 3 credits per thesis supervision. These regulations can be consulted. here.

Apart from the mechanisms for information and recognition/computation of tutoring/supervision work mentioned above, the University of La Laguna has considered systems to encourage the incorporation of new researchers or professors with research results that do not allow them to act as thesis supervisors, since they have not been validated by recognition of research merit assessments. In this regard, the Official Doctoral Studies Regulations in its article 10, section 4 establishes that: "Without prejudice to the
As indicated in the previous section, a new researcher or a professor or researcher with a minimum of research experience who does not meet the requirements established to be a thesis supervisor may assume the duties of co-director. In any case, they must have a civil service or contractual relationship with the university or organization collaborating in the development of the program. There may not be more than one co-director of this profile. The aim is for these researchers/professors to acquire the appropriate level to be able to join the program as directors when they meet the conditions established by the ULL in its Regulations.

Also, in the latest amendment to the Regulation of Regulation of Hiring Assistant Professors, Collaborating Professors, Contracted Professors, Associate Professors and Assistants of the University of La Laguna, the corresponding scales, within the research activity block, include having directed doctoral theses as an assessment criterion.

Likewise, the University of La Laguna has a Commitment model document with the doctoral student, stipulated by article 21 of the Regulations of Official Doctoral Studies for the supervision of doctoral theses, which defines the respective rights and duties and reciprocal commitments of the signatories in order to ensure the achievement of the objectives previously defined during the period of preparation of the doctoral thesis, the signatories of this document being the doctoral student, the thesis director who guides the research project (or tutor, if applicable) and the Vice-Rector with responsibilities in doctoral studies.

Finally, the University of La Laguna's Official Doctoral Studies Regulations include Article 28, which refers to the International Mention. Based on this article, the Procedure for Requesting the International Mention in the doctoral degree has been developed. In this regard, the participation of international experts is planned in the monitoring committees, in the issuance of reports prior to the presentation of doctoral theses, and in the thesis-reading panels.

Article 30 of the ULL's Official Doctoral Studies Regulations provides that, in the joint supervision regime for doctoral theses between the University of La Laguna and a university in another country, experts from other countries may participate with the aim of creating and developing scientific cooperation between research teams from both institutions and facilitating the mobility of doctoral students.

This doctoral program adheres to the European Charter for Research and Code of Conduct for Research Recruitment, embracing the principles of intellectual freedom, ethical praxis, professional responsibility, transparent and efficient financial management of funds, shared responsibility of institutions in the appropriate dissemination of results, and efforts in continuing education, along with the role of established researchers in promoting younger researchers. Likewise, the ULL will guarantee the principles and rights regarding pluralism, ideological and religious freedom, non-discrimination based on ethnicity, nationality, or sex, and equal opportunities, with special attention to people with disabilities. It will also guarantee confidentiality in the custody and processing of doctoral students' personal data in its possession.

Regarding placements at other centers, joint supervisions, and international mentorships, based on the development of these activities in recent years, the number of doctoral students opting for them is expected to increase.

The goal is for at least 50% of students to earn the international distinction, which entails a stay of at least three months at another foreign institution.

As indicated in the context of the program, the various research teams have signed personnel exchange agreements with various non-European institutions, which can be consulted in this link for the doctorate, with countries such as Belgium, Italy, Portugal, the Czech Republic and Romania.

Currently, agreements with foreign institutions are being adapted to the Erasmus+ program. This will allow for greater flexibility when choosing a destination for stays.