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This study aimed to examine the impact of the internal control system (ICS) on the performance of publicly traded Ghanaian commercial banks, within the context of the core components of the COSO integrated ICS. Accordingly, the study investigated employees' perceptions of the impact of the ICS components on financial performance-FP and non-financial performance-NFP and whether a significant relationship exists between these perceptions. In the study, the core components of the COSO’s ICS (control environment, risk assessment, control activities, information-communication, monitoring) were considered as independent variables, while FP and NFP of the banks were considered as the dependent variables. In line with the study's objective, the hypotheses were designed as follows: H1: The ICS has an impact on the FP. H2: The ICS has an impact on the NFP. Methodologically, a descriptive online survey method was used to collect data. The survey was sent to 113 managers and employees working in the internal control and audit departments of 23 listed Ghanaian banks, and 73 employees, representing 64.6%, provided voluntary feedback. Data were analyzed using SPSS-25. The survey, which was suitable for a 5-point Likert scale, included statements regarding COSO internal control components and FP and NFP. The study revealed that there were no differences in FP among the ICSs but there were differences in NFP among the ICS. The study concluded a statistically significant relationship between the ICS and FP overall. Additionally, compared to other components whose impact on FP was limited, the COSO Information-Communication component indicated the highest significant relationship with FP and the greatest positive impact, while the control activities component had an inverse effect on FP. Furthermore, the study also revealed a significant overall relationship between the ICS and NFP. In addition, compared to other components whose impact on NFP was much more limited, the COSO Information-Communication component showed the highest significant relationship with NFP and the highest positive impact on NFP. This study is considered to contribute to the literature and to investors, shareholders, policymakers, etc., by examining all factors together, such as the impact of COSO internal control components on FP and NFP, and the internal control and audit department staff at the headquarters and branches of listed Ghanaian commercial banks.

This study mainly aimed to examine the impact of the effectiveness of the internal control system on store performance through the example of D&R Store in the retail media sector in Türkiye.  In the study, it was investigated whether the effectiveness of the internal control system has a significant and positive effect on the perception of store performance through the COSO internal control components. It was also investigated whether these perceptions differed according to demographic characteristics. Methodologically, a descriptive online survey method including a questionnaire prepared in accordance with the 5-point Likert scale was used to collect data. 302 employees responded to the survey included statements regarding demographic characteristics and COSO’s main internal control components. The data were analyzed with SPSS-22. The study concluded that all COSO internal control components (control environment, risk assessment, control activities, information-communication, monitoring) have a positive and significant effect on store’s performance perception. Furthermore, the study revealed that these perceptions differed according to demographic characteristics. While statistically significant differences in perceptions were found according to demographic characteristics such as gender, job position, and years of professional experience, no significant differences were found based on demographic criteria such as age and educational level. The study is considered to contribute to the literature because it is the first study to investigate the impact of the effectiveness of the COSO internal control system components on store performance together with the example of D&R Store in the retail media sector. The study is limited by the selected sample store, number of participants, survey questions-answers, the applied statistical analysis methods and tests. Therefore, in order to reach more general results, it is suggested to expand the studies with more diverse and larger numbers of stores in the retail media sector, employees, survey questions and statistical methods.