In the first part of the discussion, investigative reports tend to be extremely technical and very detail oriented.  What a regular report may list in one page, an investigative report may take four or five. There are many reasons for this, some of which include details that may be needed for legal issues or accounting purposes.  The wording is all written very precise , and in moist details, no details are left out.  The best way for a do obtain the information they want from this type of a paper is to take notes and specifically pay attention to the main body of the text.  Combining these two ideas should be of significant help in this case.

In the second part of the discussion, The parts of an investigative report are:

Summary .  This is the abbreviated version of the incident.  

Description.  This will include the full and detailed description of what has happened. It will be very detail oriented and long and hard to read in most cases.

Outcomes: This section tells the audience what has been  done or solved in wake of the report.  

Conclusions:  The conclusion is, in my opinion, the part of this report that can be interpreted incorrectly and cause miscommunication.  The conclusion is the authors opinion, based on what they have seen or heard.