Differences between the models are specified, especially those that are subject to experimental testing.

However, because of its mathematical simplicity, it is still used, even though it is known to represent only general trends.

A simple translation can be made between model age and percentage of carbon-14.

CONSTRAINTS Any model of carbon-14 dating must satisfy certain constraints.

First, since carbon-14 dating is objective and reproducible, it cannot be ignored.

Those who use the 5730-year value are supposed to explicitly state that they are doing so.

THE EVOLUTIONARY MODEL The next model we will consider, the evolutionary model, in common with all the other models except the uniformitarian model, uses a calibration curve to convert radiocarbon years to real-time years.

Suggestions are offered for experimental projects that would resolve these uncertainties.

In this paper I will discuss eight categories of carbon-14 models and their experimental implications.

Therefore, any model must account for this data, and it is not reasonable to consider carbon-14 dating completely unreliable before that point, particularly when used as a relative dating method.

Another universally recognized constraint is the level of carbon-14 in geologically old material.

This simple model is no longer supported by any worker in the field.