Two different types of shelf life experiments are
1. Simple Shelf life Experiments:
In simple experiments, the goal is to estimate the shelf life of a product trial-and-error. In this, a single product studied under fixed storage conditions for a particular formulation, package, and new product. The fundamental goal of simple experiments is to calculate the shelf life of the product along with a measure of changes.
2. Comparative Shelf life Experiments:
In comparative experiments, more than two or more than two conditions shall be tested. Therefore, the main objective is to compare the conditions to estimate the effect of a set of factors on the shelf life of a product.