What must each type of incident investigated by an investigator establish?

The correct answer highlights the necessity for a systemic procedure in investigating incidents. A systemic procedure refers to a structured and methodical approach that ensures all aspects of the incident are examined consistently. This is crucial for maintaining thoroughness and reliability in investigations.

When investigators use a systemic procedure, they can follow established protocols that include steps such as securing the scene, collecting evidence, analyzing data, and documenting findings. This methodology helps ensure that investigations are conducted in a manner that is objective and repeatable, which is vital for legal and investigative integrity.

In contrast, informal guidelines would lack the rigor and consistency needed for thorough investigations, while a global procedure may not address the specific local needs or regulations related to fire investigations. A personal methodology could introduce subjectivity and variability in the investigative process, which could lead to unreliable results. Thus, a systemic approach is essential for producing credible and comprehensive investigations in the field of fire investigation.