Magazine No. 24 - 2018 95 Studies and other articles provided with as it could not afford collecting primary data regarding ageing population and life expectancy in terms of participation and savings behaviour. In addition, the audit team examined the collected data related to ageing population and used a variety of methods to review recent trends in retirement security and explore what these trends could mean for the funds and the public finance. The audit team strived to obtain recent trend data from the relevant stakeholders as it noted that the retirement funds financial statements suffered from significant shortcomings that made it extremely difficult to base trends analysis on the information contained in these statements. To overcome such difficulty, the audit team based its investigations on ISSAI 1600 (Practice Note to ISA 600: Special Considerations…). Given that the two social security funds are financially interlinked and have reciprocal transactions, the Tunisian Court of Accounts focused on these transactions. This has made it possible for the audit team to detect significant financial risks for the retirement system and ageing population. This has included not proceeding to regular attribution of pension increase, bilateral accounts justification for both financial incomes and expenses and doubtful debts. The Court has complemented its audits procedures by adding insights and examples from health care documents, fiscal administrations, and studies from private institutions. This turned to be a good decision as this approach to compiling data enabled the Court to reveal that ageing issues arenot theunique fundamental issues to retirement system. The large amounts of wasted funds resulting from non-compliance acts in retirement contribution and pension’s payment could not be revealed without compiling data. Section 2: Materiality issues Reporting on retirement issues has also been subject to discussion regarding materiality as many questions arise on the extent to which the Court might be producing relevant and material conclusions with a wide range of agencies and experts publish retirement related studies with comparable contents to the Court’s reports. Government and parliament receive reports, studies and written insights related to this topic on regular basis. As per materiality requirements, the Court had to form conclusions to influence the decisions of the indented users which are basically government, parliament, workers and entrepreneurs unions and of course retirement funds. It has lately decided to publish a special report on the public sector retirement fund in which it put focus on some conclusions in order to bring the intended users with material elements that other reports and studies do not any way provide general public with. 1. Subject matter expertise With regard to other SAI’s experiences in audit of retirement related issues in general and assessing impact of ageing population and life expectancy on public finances, it is worth noting that most of them rely on expertise across a range of areas, including demographic trends, actuarial science and social security.