The Practical Application of the Relationship Between NFPA 1033 and NFPA 921 Credit Hours: 2 Approximate reading time: 1 Hour Approximate online time: 1 Hour You Must Be Signed In To View This Program. Register Today NFPA Documents Disclaimer- NFPA and other resource editions cited within the CFITrainer.Net site were current as of the release of the respective modules. The field of fire investigation and its guiding documents are constantly evolving and it is incumbent upon the fire investigator to remain up to date with the guidance in the current editions of the documents referenced in all modules on CFITrainer.Net, regardless of which edition was used in the writing of the module. Program Abstract This module explains the relationship between NFPA 1033 and NFPA 921. It then takes one example of this relationship, the scientific method, and shows how that concept, as required by NFPA 1033, is implemented at the fire scene using information from NFPA 921. The module closes with a discussion of the positive impacts of understanding this relationship and implementing the application process at the fire scene.