Sincere is an accounting firm providing full scope assurance related services, including due diligence and other agreed-upon services as special investigations.

Engagement to perform agreed-upon procedures relate to certain procedures concerning individual items of financial data (for example, accounts payable, accounts receivable, purchases from related parties and sales and profits of a segment of an entity), a financial statement (for example, a balance sheet) or even a complete set of financial statements.
Accounting Advisory Services will provide a report of the factual findings of agreed-upon procedures, where no assurance is expressed. Instead, users of the report assess for themselves the procedures and findings reported by the Accounting Advisory Services and draw their own conclusions from the auditor's work.

Examples of agreed-upon procedures include due diligence and other special investigations (e.g. in the field of internal control, ICT, or general accounting issues).

Sincere provides agreed-upon procedures in accordance with the International Standard on Related Services applicable to agreed-upon procedures engagements as issued by the International Federation of Accountants and standards as issued by the Dutch Institute of registered Auditors ("NIVRA").