Arguably, a crime scene reconstructionist is a forensic scientist who specializes in interpreting and assembling evidence in a coherent manner. Chisum and Turvey explain that to perform crime reconstruction one need not "be an expert in all forensic disciplines" but "must become an expert in only one: "the interpretation of the evidence in context"." The crime scene reconstructionist may not be the person who carries out laboratory analysis of evidence such as developing DNA profiles or performing firearms and toolmark analysis; however, the competent crime scene reconstructionist must understand the meaning of each various piece of evidence and how it fits within the overall context of the scene. In this way, the crime scene reconstructionist is able to assemble the necessary puzzle pieces to make the picture visible.