It is postulated here that the steps where the product is exposed to uncontrolled ambient temperature, e.g., loading and unloading of the product, would be the most vulnerable to the changes in the average ambient temperature.
There are certain issues that arise when implementing such a system. One of them is that at certain time t the product would not always be in the same location in the SC. This makes the use of the historic data a bit more complicated since the historic data cannot be simply replaced from certain time t onward. Apparently the actual location of the product in the SC must be known in order to be able to use the historic data. The other issue is that the temperature at certain location obtained from real time monitoring and from historic data may not match. The above issues can be resolved with careful considerations.
The SLP can be implemented as deterministic or stochastic model while the QMRA should be implemented only as a stochastic model since it will provide a probability for illness upon consumption of the product. The deterministic model uses less number of operations and therefore is faster, however the utility of the stochastic model is higher.