The student clearly stated an appropriate and specific question for the historical investigation, focusing on the extent to which martial law was imposed in Poland on 13th December 1981 to pre-empt the invasion of the USSR. The question selected has a clearly defined scope, with a specific date and historical event. The student chose appropriate and relevant sources for the investigation, including working notes from a session of the CPSU and the martial law proclamation by Wojciech Jaruzelski. The student also explained the relevance of the sources in great detail, highlighting their importance in understanding the government's perspective and the context of the decision. However, the student is advised to provide a more clear explanation of the nature of the sources and to follow a structured approach when analyzing their values and limitations. Additionally, the student should address the limitations and values of the content of the sources, such as the ability to access secret and important information from the meeting, but the inability to prove its truth.
