Logic Tests

A fifth essential tool is logic testing, using several kinds of logical reasoning. Investigation Catalyst offers guidance, but the investigator must supply the reasoning. Reasoning produces the configuration of the EBs and links on the Matrix.

• Sequential reasoning is required to position the EBs in their proper sequence relative to each other.
  
  
• Inferential reasoning is required to infer EBs that may not be reported but must have happened for known EBs to occur, and also to translate observed conditions into inferred EBs that must have occurred to produce the observed conditions.
  
  
• Hypothetical reasoning is required to developed possible actions that might have occurred between two known EBs on the Matrix to fill the gap.
  
  
• Necessary and sufficient reasoning is required to decide if the EBs leading to the target EB include all and only those necessary to produce the target EB every time they occur.