The establishment of minimum requirements for performing and reporting measured reactivity is a crucial aspect in heterogeneous catalysis research. Because kinetic effects play a dominant role in catalysis, the reactivity is not only sensitive to the catalyst synthesis procedure and to the resulting as-synthesized, fresh catalyst, but also to the conditions to which the material is exposed prior to and during the reaction, for instance the temperature and the composition of the gasphase (feed) in contact with the solid. In this work, we focus on nine common vanadium-based oxidation catalysts (Fig. ). These materials were prepared, in a reproducible manner, in large batches (15-20 g) to guarantee that comprehensive catalyst characterization and testing is performed using samples from the same batch. The catalyst preparation consists on the catalyst synthesis itself, plus calcining, pressing and sieving. The materials resulting from the catalyst preparation are called fresh catalysts. After catalyst preparation, all the catalysts were tested for the C3-oxidation reaction using a fixed-bed reactor (Fig. ). The catalyst test starts with an activation procedure during which the synthesized materials are exposed to the reaction feed and rather high temperature (e.g., 450 ºC) for 48 hours. The activation condition is that the conversion of either propane or oxygen is 85%. The materials resulting from the activation procedure are called activated catalysts. The goal of the activation procedure is to obtain samples as similar as possible to the catalytically active materials formed during the induction period of the reaction. Indeed, some catalysts undergo structural modifications during the activation procedure. For this reason, their properties differ significantly between fresh and activated catalyst samples (see data set provided in Electronic Supporting Information, ESI).