Hi Bernard, I am wondering on what is based the change in the objective to produce SoG Si in 2/3 of the actual steps instead of one step. In the March 14 2018 news realease, it is written: HPQ's first goal is to develop, in collaboration with industry leaders Pyrogenesis (PYR.T) and Apollon Solar the innovative metallurgical PUREVAP™ "Quartz Reduction Reactors (QRR)" process (patent pending), which will permit it to produce SoG Si in one step. In the August 13 2018 news release, it is written : HPQ goal is to develop, in collaboration with industry leaders that are experts in their fields of interest, the innovative metallurgical PUREVAP™ “Quartz Reduction Reactors (QRR)” process (patent pending), which will permit the transformation and purification of quartz (SiO2) into high purity silicon metal (Si) in one step and reduce by a factor of at least two-third (2/3) the steps required to transform quartz (SiO2) into SoG Si.