Key Steps of an Effective Internal Investigation

Internal investigations are among the most important processes for testing a company’s ethical culture, control environment, and management approach when a suspicion or allegation arises. In Türkiye in particular, rapid growth, close supplier relationships, relationship-driven business practices, and not yet fully institutionalized processes can make fraud risks more complex. For this reason, a well-managed investigation does more than uncover the truth; it also demonstrates to employees, business partners, and the public that the company does not tolerate or conceal wrongdoing.

How this process is managed directly affects the success of the investigation. Our experience shows that many companies in Türkiye are often unprepared when faced with a whistleblower report, a suspected conflict of interest, an improper supplier relationship, or an unusual transaction. In some cases, the process is weakened because evidence is not secured in time; in others, the matter is not treated with the seriousness it requires. Yet missteps may not only prevent the truth from emerging, butmay also damage the company’s credibility and ethical culture.

In the following sections, we will outline the key steps that are critical to conducting an internal investigation in a sound and reliable manner.

Assessment of the Allegation and Preliminary Indicators

Internal investigations often arise from a whistleblower report, irregularities identified during management review, or findings uncovered through audits. At the initial stage, the credibility and reliability of the information received are assessed. The aim is to determine whether the issue reflects a simple error, a control deficiency, or a genuine indicator of fraud.

If, following this preliminary review, the allegations are found to be credible or the likelihood of misconduct is considered significant, the investigation process is formally initiated.

Preparation of the Investigation Plan

Once the decision to proceed with an investigation has been made, the first step is to plan the process properly. At this stage, the purpose and scope of the investigation are defined. The specific matters to be examined and the investigation methods to be used, such as document review, data analysis, and interviews, are identified. In addition, the roles and responsibilities of the team members involved are clearly assigned. This provides a structured framework for how the investigation will be conducted.

Evidence Collection and Analysis

At this stage, documents, records, digital data, and other relevant materials are first secured. The collected information is then examined through forensic accounting and other investigative techniques. The principal methods used at this stage are summarized below.

a) Forensic Accounting Reviews

• Accounting records, together with digital and physical documents, are collected and reviewed.
• Analyses, such as data analytics and ratio analyses, and tests, such as the examination of suspicious transactions or physical counts, are performed.
• Potential losses and economic damages are quantified.
• Evidence is documented and preserved in a manner suitable for use in legal proceedings.

b) Digital Forensics and Electronic Data Review (E-Discovery)

• Digital data stored on company-owned devices used by the employee, such as computers, mobile phones, and external drives, is collected through forensic imaging using digital forensic methods.
• Deleted or damaged data may be recovered.
• Data is indexed and made searchable through keyword searches.
• Advanced digital analysis software and AI-based tools are used to extract meaningful findings from large volumes of data.

c) Corporate Intelligence

• Information on suspicious individuals and entities is gathered from open sources, such as trade registries, social media, and press coverage, as well as cyber intelligence tools.
• Potential conflicts of interest and connections are investigated.
• On-site visits may be conducted to verify the operations and physical existence of suspicious companies.

Interviews with Suspects and Employees

During the investigation process, interviews are conducted with the whistleblower, witnesses, and suspects. Interviews with the whistleblower help clarify the source, motivation, and credibility of the allegation and assist in shaping the direction of the investigation. Interviews with witnesses are important for understanding observations relating to the incident and corroborating the findings. Interviews with suspects, on the other hand, play a critical role in obtaining explanations regarding the allegations, identifying inconsistencies, assessing possible defences, and, where applicable, securing admissions.

Evaluation of Findings

This stage involves bringing together and reviewing all information and evidence collected throughout the investigation. Documents, records, digital data, and interview notes are considered collectively, and consistency across the evidence is assessed. In this way, fragmented pieces are assembled into a coherent whole, allowing the investigation to present the most accurate possible picture of what occurred.

Reporting

At the conclusion of the investigation, all findings, conclusions reached, and recommended actions are set out in a report. This report ensures transparency in relation to the process and provides management with a concrete basis for decision-making. Where necessary, it may also serve as an official record that can be relied upon in legal proceedings.

Conclusion

Internal investigations are critical processes that test a company’s ethical stance and control environment at a moment of real risk. In Türkiye in particular, business dynamics and third-party relationships can make fraud risks more complex, making it all the more important that such processes are carried out in a prepared, systematic, and evidence-based manner. A properly managed investigation contributes not only to uncovering the truth, but also to preserving institutional trust.

You never know when fraud may come to light. But you can be prepared. The real question is: does your company truly know what to do when that happens?