All decisions involving lethal force used for self defense involve these three subject areas:
the person (yourself);
the weapon (some prefer the term firearm);
The next three posts will explore each in some detail, though here is a thumbnail sketch: before discharging your firearm you will analyze within the time available your capabilities as they may be affected by a variety of factors, the suitability of the firearm you intend to use, and the complications of the surrounding environment. In short, these elements form the foundation of what is often referred to as "situational awareness."
The next post will explore how your personal decision-making process is affected simply because of your human condition.