Final answer:
Planning the crime in advance can serve as a mitigating or aggravating factor, depending on the details.
Step-by-step explanation:
The factor that may serve as either a mitigating or aggravating factor, depending on the details, is planning the crime in advance.
If the details of the case show that the planning was done with the intention of minimizing harm or avoiding violence, it can be considered a mitigating factor. On the other hand, if the planning was done to maximize harm or make the crime more heinous, it can be viewed as an aggravating factor.
For example, a person who plans a robbery to ensure no harm is done to anyone would be seen more leniently compared to someone who plans a robbery with the intention of causing harm or violence.
Learn more about Factors influencing criminal sentencing