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The most common way followed for the determination of degradation mechanisms of organic materials is the application of physicochemical methods after accelerated ageing.In recent years,there has been a remarkable research activity towards the development of alternative decay determination methods in organic materials based on statistics.In the project "Investigation of the environmental factor effects on organic materials constituting the natural and cultural heritage(INVENVORG PROJECT)",statistics plays a crucial role not only in the experimental design but also in the elaboration of the results,in order to highlight complex and non-obvious relationships("hidden")between a large number of variables associated with studied systems,at a given time or in their dynamic(Chemometric studies).It is presented a statistical methodology that is based on a designed experimental and inferential protocol which will guide the research throughout the project.In particular,the experiments hypotheses are stated,a randomized fractional factorial design is designed,the required sample size is estimated and all necessary statistical tests that will be used after the data collection are provided.Such statistical protocols are necessary for scientifically sound quantitative experiments.It is outlined here the guiding principles followed by all participants of INVENVORG for the construction of experimental protocols before they start their experiments.