This dataset presents the results of an experiment evaluating a knowledge-based system designed to support the soundness of digital forensic investigations. The study assesses the system’s effectiveness in assisting digital forensic investigators, with a particular focus on various phases of the investigative process. A randomized controlled trial was conducted involving 60 students enrolled in an Introduction to Digital Forensics course. Participants were divided into experimental and control groups, both of which performed identical tasks. The experimental group utilized the proposed system to complete these tasks.