The purpose of this tender procedure is the contracting of the service of a CRO specialized in the management of phase I-IV clinical trials, research training, capacity building and clinical trial auditing for the data management, medical writing and biostatistical services for the study “Mother and Child interventions for Chronic Undernutrition in Angola. A community cluster and cost-effectiveness trial” (MuCCUA study) as part of the project “Operative Research Against Chronic Child Malnutrition in Angola” (CRESCER project)- of the Fundació Hospital Universitari Vall Hebron - Institut de Recerca (VHIR). The selected CRO, which must have knowledge and experience with clinical trials, must be in charge of the data management, medical writing and biostatistical services of the referred community trial specifically the following tasks: development and management of the electronic Case Report Form (eCRF) and associated Completion Guidelines and Data Management; final Statistical Analysis Report (SAR); final Clinical Study Report (CSR); and Publication.