Eligibility of applicants and roles in the project This is an invite-only call, meaning each WWTF-funded ME/CFS 2024 Understanding ME/CFS project is eligible to submit one proposal. This can be done by one of the Principal Investigators. The general eligibility of applicants is specified in the  WWTF Funding Guideline .  A project’s  core team  may include  up to   three Principal Investigators (PIs).  This includes a PI&C and up to two co-PIs. Core team members may share equal management and scientific roles in the projects. WWTF especially encourages young and female scientists to apply as PI. Each core team member must submit a CV , which will form part of the evaluation. A researcher may appear as a core team member (i.e., PI&C, co-PI) in a maximum of two proposals in this call. One PI must be designated as  PI&C . For legal and administrative reasons (contact person, funding contract, reporting), WWTF requires a PI&C to be named. The  PI&C must have an affiliation at a Viennese research institution, which will serve as a legal contract partner. Up to two  co-PIs  may also be named in the core team. Co-PIs may be based in Vienna, Lower Austria or elsewhere (in Austria or internationally) in fulfilment of the requirements of regular WWTF projects or Joint Projects (see below). Additional  project partners and collaborators  are permitted in the research team. Non-academic collaboration partners (e.g., NGOs, patient advocate groups, etc.) are eligible for funding to a certain extent. Industry partners are not eligible for funding. Research partners outside Vienna: Project partners outside of Vienna may receive up to 30% of the total requested funding.