The student did not clearly state an appropriate and specific research question for the historical investigation, as the current question lacks clarity regarding what "incompleteness of the Soviet system" entails. Additionally, the scope of the question is not well-defined, as it does not specify the relevant dates or significant events surrounding the Chernobyl disaster. While the student chose appropriate and relevant sources, and effectively explained their relevance, the analysis of the values and limitations of the sources is insufficient. The student failed to provide a precise evaluation of the origins, purposes, and content of the selected sources, which are necessary for a thorough investigation.
