Objective: to evaluate the implantation of the Notifiable Diseases Information System (SINAN) in Pernambuco, Brasil, 2014. Methods: This was an evaluation study based on primary data (interviews) and secondary data (SINAN documents/ data) provided by the State Health Department and its Regional Divisions in order to estimate the degree of SINAN implantation, comparing structure and process indicators with results achieved. Results: SINAN was found to be partially implemented at central level (77.2%); and at regional level (61.2%), ranging from 54.7 to 71.6%; the following components had been implemented: reporting/investigation (90.0%) and processing (84.1%); analysis/divulgation had been partially implemented (61.6%); while monitoring (53.4%) and management (56.8%) were incipient; there was a lack of planning and published information bulletins; 46.9% of municipalities closed compulsory reporting on time; 68.7% sent batches regularly, 3.0% of tuberculosis cases were duplicated. Conclusion: SINAN was found to be partially implemented in Pernambuco due to shortcomings in monitoring and management, with negative influences on system results; its strengths related to reporting, investigation and data processing.