Facts can be determined based upon four categories of methods:
1. Personally observed.
2. Personally determined or calculated.
3. Sourced Facts
4. Assumed and Unsupported
These facts have been determined based upon the arguer’s actual experience as determined by one or more of the five senses. Example: I went into this parking lot and there were four red cars.
PERSONALLY DETERMINED OR CALCULATED
These facts have bee personally ascertained, not through the exercise of the five senses, but rather arrived at based upon a calculation, estimation, or ascertain using other necessary but separate facts. For example, I can calculate the area of a square if I know the length of the radius.
The facts have been claimed by another person or authority. Often this is the most common source of facts for us in life as well as argument. We rely upon information given to us by others.
ASSUMED AND UNSUPPORTED FACTS
These facts have been determined using no acceptable form of methodology.