Final answer:
The scope of an investigation and personnel involvement are typically determined by the type of incident, the individuals involved, and the severity of the incident. The time an incident occurred may also affect the investigation's logistics.
Step-by-step explanation:
The scope of an investigation and the involvement of different personnel is likely to be determined by several factors. These can include a) the type of incident, which may determine what skills are required in the investigation, b) the individuals involved in the incident, which might necessitate specific experts or investigators with particular expertise, and c) the severity of the incident, which often influences the level of resources and urgency applied to the investigation. While not a primary factor, d) the time the incident occurred may also play a role in the logistics of the investigation, such as availability of personnel. However, the three main determinants usually include the type, the individuals involved, and the severity of the incident.