Mark Roycroft is Senior Lecturer at The Open University, UK, and he has lectured on terrorism, organised crime, criminology and investigative theory. He was formerly a police officer for 30 years in the Metropolitan Police Service with postings in homicide teams, counter terrorism and criminal intelligence. He is the author of Police Chiefs in the UK.Jason Roach is the Director of the Applied Criminology and Policing Centre at the University of Huddersfield, the Editor of The Police Journal, and a chartered psychologist. Jason has worked in an academic setting for the past 15 years He has published research on a wide-range of topics including: investigative decision-making, terrorism, cold-case homicides, and evolutionary psychology. He has also co-authored three books with Professor Ken Pease, the most recent being Self-Selection Policing in 2016. His main area of research expertise is with police and offender decision-making.

• 1. Introduction; Mark Roycroft.- 2. History of Investigative decision making from public inquires and reviews; Dr Mark Roycroft.- 3. The decision making and identification of solving factors from 166 murder cases; Dr Mark Roycroft.- 4. Innate reasoning and critical incident decision-making; Prof Robin Bryant.- 5. How a major incident Room operates and the management of critical incidents; ex DCI Harland N Yorks Police.- 6. “The Making of an expert detective” Decision making in Norway and UK European perspective; Ivar Fashing, Superintendent and Professor Norwegian Police University.- 7. The task is greater than the title: Professionalising the role of the Senior Investigating Officer in Homicide Investigations; Dr Adrian West and Dr Declan Donnelly.- 8.  The retrospective detective. Cognitive bias and the cold case investigation; Dr Jason Roach.- 9. Conclusions; Dr Mark Roycroft.

Mark Roycroft is Senior Lecturer at The Open University, UK, and he has lectured on terrorism, organised crime, criminology and investigative theory. He was formerly a police officer for 30 years in the Metropolitan Police Service with postings in homicide teams, counter terrorism and criminal intelligence. He is the author of Police Chiefs in the UK.Jason Roach is the Director of the Applied Criminology and Policing Centre at the University of Huddersfield, the Editor of The Police Journal, and a chartered psychologist. Jason has worked in an academic setting for the past 15 years He has published research on a wide-range of topics including: investigative decision-making, terrorism, cold-case homicides, and evolutionary psychology. He has also co-authored three books with Professor Ken Pease, the most recent being Self-Selection Policing in 2016. His main area of research expertise is with police and offender decision-making.

• 1. Introduction; Mark Roycroft.- 2. History of Investigative decision making from public inquires and reviews; Dr Mark Roycroft.- 3. The decision making and identification of solving factors from 166 murder cases; Dr Mark Roycroft.- 4. Innate reasoning and critical incident decision-making; Prof Robin Bryant.- 5. How a major incident Room operates and the management of critical incidents; ex DCI Harland N Yorks Police.- 6. “The Making of an expert detective” Decision making in Norway and UK European perspective; Ivar Fashing, Superintendent and Professor Norwegian Police University.- 7. The task is greater than the title: Professionalising the role of the Senior Investigating Officer in Homicide Investigations; Dr Adrian West and Dr Declan Donnelly.- 8.  The retrospective detective. Cognitive bias and the cold case investigation; Dr Jason Roach.- 9. Conclusions; Dr Mark Roycroft.

Mark Roycroft is Senior Lecturer at The Open University, UK, and he has lectured on terrorism, organised crime, criminology and investigative theory. He was formerly a police officer for 30 years in the Metropolitan Police Service with postings in homicide teams, counter terrorism and criminal intelligence. He is the author of Police Chiefs in the UK.Jason Roach is the Director of the Applied Criminology and Policing Centre at the University of Huddersfield, the Editor of The Police Journal, and a chartered psychologist. Jason has worked in an academic setting for the past 15 years He has published research on a wide-range of topics including: investigative decision-making, terrorism, cold-case homicides, and evolutionary psychology. He has also co-authored three books with Professor Ken Pease, the most recent being Self-Selection Policing in 2016. His main area of research expertise is with police and offender decision-making.

• 1. Introduction; Mark Roycroft.- 2. History of Investigative decision making from public inquires and reviews; Dr Mark Roycroft.- 3. The decision making and identification of solving factors from 166 murder cases; Dr Mark Roycroft.- 4. Innate reasoning and critical incident decision-making; Prof Robin Bryant.- 5. How a major incident Room operates and the management of critical incidents; ex DCI Harland N Yorks Police.- 6. “The Making of an expert detective” Decision making in Norway and UK European perspective; Ivar Fashing, Superintendent and Professor Norwegian Police University.- 7. The task is greater than the title: Professionalising the role of the Senior Investigating Officer in Homicide Investigations; Dr Adrian West and Dr Declan Donnelly.- 8.  The retrospective detective. Cognitive bias and the cold case investigation; Dr Jason Roach.- 9. Conclusions; Dr Mark Roycroft.