What are the two types of investigating?

• A. Direct and Indirect
• B. Initial and Final
• C. Formal and Informal
• D. Primary and Secondary

Answer: (D)

Two types of investigating are primary and secondary. The primary investigation is the initial, on-scene effort to quickly establish what happened, collect immediate facts, preserve evidence, and determine the sequence of events. It answers the basic questions about the incident in the moment and gives a first picture of causation. The secondary investigation follows later to verify the initial findings, fill in gaps, and identify root causes. It draws on additional sources like logs, maintenance records, drawings, and expert analysis to evaluate whether failures came from design, procedures, training, or equipment issues and to develop corrective actions. This combination ensures fast, practical information right at the scene and thorough analysis afterward to prevent recurrence. Other options don’t fit this common two-type framework: direct/indirect refer to evidence relationships, initial/final describe stages rather than types, and formal/informal describe how the investigation is conducted rather than a paired type.