The student clearly stated an appropriate and specific research question for the historical investigation, focusing on the Soviet Invasion of 1979 and its relation to Afghanistan's political and economic weaknesses between 1973-78. The question is well-defined in terms of scope, including relevant dates, significant historical figures, and key events. The student selected appropriate and relevant sources, such as a journal article and a speech, and effectively explained their relevance to the investigation. While the student did not categorize the sources as primary or secondary, they successfully identified the forms and purposes of each source, providing thorough analyses of their values and limitations. Overall, the student's work demonstrates a comprehensive understanding of the topic and the sources used in the investigation.
