Miller, Joel. "Contemporary Modes of Probation Officer Supervision: The Triumph of the “Synthetic” Officer?" JQ: Justice Quarterly 32, no. 2 (April 2015): 314-336.
This article considers the continued relevance of law enforcement and social worker roles to probation officer practice, a central motif in community corrections scholarship. It also considers how these traditional functions are integrated into community-oriented supervision practices, increasingly emphasized in policy circles. Using Latent Class Analysis of data from a national community corrections survey, a four-class typology of probation officers was developed, based on their supervision practices. While classes vary according to the intensity of supervision, particularly in the engagement of third parties (family, community, and the police), there are no classes that correspond either to law enforcers or to social workers. Rather, officer classes are all “synthetic”—combining law enforcement and social work functions together in the same strategy. The analysis identifies a number of predictors of membership in more intensive supervision classes. These relate to ideological orientations, caseload characteristics, officer demographics, and agency progressiveness.

Criminal Justice System Flowchart
On its website, the Bureau of Justice Statistics features a flow chart illustrating the typical sequence of events in the criminal justice system.  
Juvenile Justice System Structure and Process
This case flow diagram is featured on the Office of Juvenile Justice Delinquency Prevention website. It illustrates the stages of delinquency case processing in the juvenile justice system. [description from website] 

Lovins, Brian, Francis T. Cullen, Edward J. Latessa and Cheryl Lero Jonson, "Probation Officer as a Coach: Building a New Professional Identity.Federal Probation 82. no. 1(2018): 13-19,