  This volume contains the proceedings of F-IDE 2018, the fourth international
workshop on Formal Integrated Development Environment, which was held as a FLoC
2018 satellite event, on July 14, 2018, in Oxford, England.
  High levels of safety, security and also privacy standards require the use of
formal methods to specify and develop compliant software (sub)systems. Any
standard comes with an assessment process, which requires a complete
documentation of the application in order to ease the justification of design
choices and the review of code and proofs. Thus tools are needed for handling
specifications, program constructs and verification artifacts. The aim of the
F-IDE workshop is to provide a forum for presenting and discussing research
efforts as well as experience returns on design, development and usage of
formal IDE aiming at making formal methods "easier" for both specialists and
non-specialists.
