Self-Administered Interview

Self-Administered Interview (SAI©)

The Self-Administered interview, or SAI©, is an investigative tool that can be used to quickly and efficiently elicit comprehensive initial statements from witnesses. It takes the form of a standardised protocol of clear instructions and questions that enable witnesses to provide their own statement, and is therefore ideal for use when restricted resources mean that a traditional interview is not possible. 

Experimental tests of the SAI have shown that it elicits significantly more accurate and detailed information than a free-recall request. Completing an SAI also strengthens witness memory as a function of retrieval practice - this should work to protect against forgetting and also against exposure to potentially distorting post-event information. The SAI can add value to any incident investigation, from police or medical incidents, to industrial accidents and insurance investigations. Live trials with police forces have demonstrated the SAI can facilitate an investigation by obtaining critical information quickly and effectively.

The SAI was developed to address the serious challenge faced by investigators when an incident occurs for which there are numerous eyewitnesses. Any of these witnesses may hold potentially vital information about the incident and descriptions of the perpetrators i.e. information that will provide both critical leads for the investigation or compelling evidence in a trial. However, investigators do not always have the resources in terms of time, expertise or personnel to conduct detailed interviews with many witnesses shortly after an incident.

Given that eyewitness memory for details of a witnessed incident is under threat in two key ways, the preservation of witness accounts is crucial. In any witnessing situation, memory is prone to decay and this ‘forgetting’ will occur naturally and within hours of the incident. As the delay between witnessing and a formal investigative interview increases, memory decay levels out so while witnesses may still be able to provide a general account, potentially vital details for an investigation may have been irretrievably lost. Another important threat to accurate witness recall is contamination of the original memory by inaccurate information encountered between actually witnessing the event and providing the police with an account of the incident.

To address these challenges, the research team comprising of Professor Lorraine Hope (University of Portsmouth), Professor Fiona Gabbert (Goldsmiths, University of London) and Professor Ron Fisher (Florida International University) developed and tested a witness reporting protocol or ‘tool’ that enables investigators to protect witness memory and access detailed witness accounts before that information becomes lost or distorted. Early stage development of the SAI focused on creating a clear set of written instructions and questions that could easily be understood by witnesses while drawing on the core principles of the Cognitive Interview Technique. In early tests of the SAI, mock witnesses (comprising a sample of community volunteers of all ages and background) viewed a simulated event and were required to report as much as they could about what they had seen. Witnesses in who completed the SAI tool reported 42% more correct details than those participants who were simply asked to report what they had seen. In subsequent tests, mock witnesses who had completed the SAI tool shortly after witnessing the event provided almost 30% more correct details when interviewed after a delay than those who had not made an earlier recall attempt. These results suggest that the SAI prevents against memory loss (Gabbert, Hope & Fisher, 2009). Subsequent research has replicated and extended these findings. Specifically, we have found that mock witnesses who complete an SAI after witnessing a simulated crime remember more information following a delay of one month, than do control participants (who have not completed an SAI) after a delay of one week. Furthermore, mock witnesses who complete an SAI are more resistant to the misleading effects of exposure to post-event information and produce more information in a subsequent cognitive interview.

Ten years on, these initial findings have been replicated and extended by other labs around the globe while the SAI has been adopted for use by law enforcement in a number of different countries - and emerged as a strategic recommendation for obtaining initial accounts (College of Policing, 2019)

In addition to benefits of enhanced witness recall, the tool also enables investigators to ‘prioritise’ witnesses for follow-up interview meaning that key witnesses are less likely to be overlooked and that resources can be appropriately allocated. In addition, the use of a standardised tool to elicit witness accounts limits any suggestion of ‘improper’ interviewing techniques and reduces any pressure from police or other interviewers which might be inadvertently perceived by witnesses.

In sum, the SAI is an  investigative tool that protects witness memory, elicits critical information effectively and permits the timely prioritisation of witnesses – particularly in situations where limited resources are available to investigators.

For more information about the research underpinning the SAI© read our published research articles:

  • Gabbert, F., Hope, L. & Fisher, R. P. (2009). Protecting Eyewitness Evidence: Examining the Efficacy of a Self-Administered Interview Tool. Law & Human Behavior, 33, 298-307.

  • Gabbert, F., Hope, L., Fisher, R. P., & Jamieson, K. (2012). Protecting against susceptibility to misinformation with the use of a Self-Administered Interview. Applied Cognitive Psychology, 26, 568-75.

  • Hope, L., Gabbert, F., Fisher, R. P., & Jamieson, K. (2014). Protecting and enhancing eyewitness memory: the impact of an initial recall attempt on performance in an investigative interview. Applied Cognitive Psychology, 28, 304-313.

For a review see:

  • Hope, L., Gabbert, F., & Fisher, R. (2011). From laboratory to the street: Capturing witness memory using the Self-Administered Interview. Legal and criminological psychology, 16, 211-226.

For a legal perspective see:

  • Hope, L., Gabbert, F., Heaton-Armstrong, A., & Wolchover, D. (2013).  Self-Administered Witness Interview. Criminal Law and Justice Weekly, 177.

More recently, we have written about the SAI in the following chapters:

Hope, L., & Gabbert, F. (2019). Interviewing victims and witnesses. In N. Brewer, & A. Bradfield Douglass (Eds.), Psychological Science and the Law The Guildford Press.

Hope, L., & Gabbert, F. (2019). Expanding the legacy of the cognitive interview: developments and innovations in evidence-based investigative interviewing. In J. J. Dickinson, N. Schreiber Compo, R. Carol, B. L. Schwartz, & M. McCauley (Eds.), Evidence-based Investigative Interviewing: Applying Cognitive Principles (1st ed., pp. 42-55). Routledge.

Read more about the application of the SAI© in the field, including:

  • Recommendations for use in the Guidelines for First Responders on Obtaining Initial Accounts from Victims and Witnesses published by the College of Policing

  • Parliamentary Office for Science and Technology (POST) Report incoporates review of the SAI© for improving witness testimony

Self-Administered Interview (SAI©)

New Developments, Directions and Projects in 2019-20

Capturing best information from witnesses to serious road traffic collisions

Funded by the Road Safety Trust (

In collaboration with South Wales Police

Research Team: Ruth Horry1, Chelsea Hughes1, Fiona Gabbert2, Lorraine Hope3

1Swansea University

2Goldsmiths University of London

3University of Portsmouth

The overall aim of this project is to increase road safety for all road users by increasing the efficiency and successful prosecution rate of investigations into serious road traffic collisions. It will develop a bespoke version of the Self-Administered Interview (SAI) specifically for use with witnesses to Road Traffic Collisions (the SAI-RTC).

Enhancing Missing Person Investigations: Development of the SAI-MISSING

Research Team:

Fiona Gabbert1, Donata Tamonyte1, Joe Apps2, Alessandra Caso1, Penny Woolnough3, Lorraine Hope4, Megan Handscomb1, & Georgina Waterworth1


1Goldsmiths University of London

2Missing Persons Unit, National Crime Agency

3Abertay University

4University of Portsmouth

The success of missing person investigations often centres on the quality of information obtained in the early stages. Reliable information can not only inform the search but might also become vital evidence if the case broadens into a criminal investigation relating to a sexual offence, abduction, or even murder. In addition to eliciting high quality information, police officers must consider that those close to the missing person are likely going through a very difficult and stressful time. Across two studies, we developed and tested a self-administered form (SAI-MISSING) designed to obtain reliable information that would meaningfully inform a missing person investigation, as well as providing a means for family and friends to be actively involved.

 In Experiment 1, 65 participants were tested individually and asked to provide a description of a person they knew well but had not seen for 24 hours. In the second study, 64 participants were tested in pairs, but immediately separated into different rooms and instructed to imagine that the person they came with has gone missing. In both studies participants completed either the SAI-MISSING tool, or a self-administered control form. In Experiment 1 we found that the SAI-MISSING tool elicited significantly more information regarding physical descriptions and descriptions of clothing and personal effects, than the comparison control form. In Experiment 2 we replicated this finding, and further showed that the SAI-MISSING tool produced higher accuracy rates than the control form.

Gabbert, F, Tamonyte, D., Apps, J., Cason, A., Woolnough, P., Hope, L., Handscomb, M. & Waterworth, G. (In press). Examining the Efficacy of a Self-Administered Report Form in Missing Person Investigations. Legal and Criminological Psychology.

The Self‐Administered Witness Interview Tool (SAW‐IT):  Enhancing witness recall of workplace incidents

Research Team: Carla MacLean1, Fiona Gabbert2, Lorraine Hope3

1Kwantlen Polytechnic University, British Colombia, Canada

2Goldsmiths University of London

3University of Portsmouth

Given the often crucial role of witness evidence in Occupational Health and Safety investigation, statements should be obtained as soon as possible after an incident using best practice methods.

The present research systematically tested the efficacy of a novel Self‐Administered Witness Interview Tool (SAW‐IT); an adapted version of the Self‐Administered Interview (SAI©) designed to elicit comprehensive information from witnesses to industrial events. The present study also examined whether completing the SAW‐IT mitigated the effect of schematic processing on witness recall. Results indicate that the SAW‐IT elicited significantly more correct details, as well as more precise information than a traditional incident report form. Neither the traditional report from, nor the SAW‐IT mitigated against biasing effects of contextual information about a worker's safety history, confirming that witnesses should be shielded from extraneous post‐event information prior to reporting. Importantly, these results demonstrate that the SAW‐IT can enhance the quality of witness reports.

MacLean, C., Gabbert, F. & Hope, L. (2019). The Self-Administered Witness Interview Tool (SAW-ITTM): Enhancing witness recall of workplace incidents. Applied Cognitive Psychology. DOI: 10.1002/acp.3568