Just as there is no single transformation methodology, there is no single modelling technique. The proposed solution must be able to suggest the most efficient model according to the profile of the data being analysed. Finally, models based on self-learning techniques will evolve as new data are fed into the database.
Beware of exceptional events, such as the COVID-19, or a one-off external growth operation, which can’t be anticipated through a model. The intervention of the business expert is crucial at this level to correct these limitations. It is also essential to have « back testing », and « out of sample » analysis processes (error analysis based on a re-training process carried out on real data) to avoid introducing bias into the model.