Act of Estimation https://www.commoncoreontologies.org/EventOntology measuring the amount of time required to do a task based on how long it took to do a similar task in the past measuring the property value of a house based on its square footage and the average cost per square foot of other houses in the area measuring the height of a building by counting the number of floors and multiplying it by the height of an average floor in an average building Act of Approximation Although the boundary between Act of Estimation and guessing is vague, estimation can be partially distinguished from guessing in that every Act of Estimation has as input some relevant information; whereas an act of guessing can occur sans information (or at least sans pertinent information). For example, if Mr. Green were asked how many blades of grass are in his lawn, he could simply choose a number (i.e. he could guess) or he could estimate the number by counting how many baldes of grass are in 1 square foot of his lawn, measuring the square footage of his lawn, and then multiplying these values to arrive at a number. Hence, many estimates may be loosely considered to be educated guesses. An Act of Measuring that involves the comparison of a measurement of a similar Entity or of a portion of the Entity being estimated to produce an approximated measurement of the target Entity. In all cases, the Agent in an Act of Estimation either lacks complete information, lacks access to the relevant information, or chooses not to use the complete information (perhaps to save money or time) about the thing being estimated; instead, the Agent uses some or all of the relevant information that the Agent does have as a basis for arriving at the estimate. Note that, while every Act of Measuring arguably involves some degree of estimation (for example, a measuring instrument rounding to the nearest ten-thousandth or an Agent reading an analog display), it would be a mistake to classify all Acts of Measuring as Acts of Estimation. This holds even for cases (e.g. census taking) in which sofisticated estimations are often more accurate than other means of measuring (e.g. enumeration). measuring how much time a train will add to your commute by measuring how long it takes for 10 train cars to pass a given point and then combining this information with an estimate of how many train cars are in a typical train based on your past experience Act of Measuring