Runtime Assertion Checking (RAC) is the discipline of verifying program assertions at runtime, i.e. when executing the code. Nowadays, RAC usually relies on Behavioral Interface Specification Languages (BISL) à la Eiffel for writing powerful code specifications. Since now more than 20 years, several works have studied RAC. Most of them have focused on BISL. Some others have also considered combinations of RAC with others techniques, e.g. deductive verification (DV). Very few tackle RAC as a verification technique that soundly generates efficient code from formal annotations. Here, we revisit these three RAC’s research areas by emphasizing the works done in E-Acsl, which is both a BISL and a RAC tool for C code. We also compare it to others languages and tools.