the actual crime scene, Three- Considering the victim's background and activities for possible motives and connections, Four- Considering other possible motives. Five- Developing a description of the possible offender that can be compared with previous cases. One type of criminal profiling is referred to as linkage analysis. Gerard N. Labuschagne defines linkage analysis as "a form of behavioral analysis that is used to determine the possibility of a series of crimes as having been committed by one offender." Gathering many aspects of the offender's crime pattern such as modus operandi (MO), ritual or fantasy-based behaviors exhibited, and the signature of the offender, help to establish a basis for a linkage analysis. An offender's modus operandi is the habits or tendencies during the killing of the victim. An offender's signature is the unique similarities in each of the kills. Mainly, linkage analysis is used when physical evidence, such as DNA, cannot be collected. Labuschagne states that in gathering and incorporating these aspects of the offender's crime pattern, investigators must engage in five assessment procedures: One- Obtaining data from multiple sources. Two- Reviewing the data and identifying significant features of each crime across the series. Three- Classifying the significant features as either modus operandi or ritualistic. Four- Comparing the combination of modus operandi and ritual or fantasy-based features across the series to determine if a signature exists. Five- Compiling a written report highlighting the findings. FBI method There are six stages to developing a criminal profile: profiling inputs, decision process models, crime assessment, criminal profiling, investigation, and apprehension. The FBI and BAU tend to study specific categories of crimes such as white collar and serial murder. History An Italian psychologist Cesare Lombroso (1835-1909) was a criminologist who attempted to formally classify criminals based on age, gender, physical characteristics, education, and geographic region. When comparing these similar characteristics, he better understood the origin of motivation of criminal behavior, and in 1876, he published the book The Criminal Man. Lombroso studied 383 Italian inmates. Based on his studies, he suggested that there were three types of criminals. There were born criminals, who were degenerates and insane criminals, who suffered from a mental illness. Also, he studied and found specific physical characteristics. A few examples included asymmetry of the face, eye defects and peculiarities, and ears of unusual size, etc. One of the first offender profiles was assembled by detectives of the Metropolitan Police on