Dear My Friend Mina,
It is a general knowledge question that how we can make sure our selves, that our total cash is deposited without any tention, for an internal controller it would be to take care of the amount of the vouchers intered in to the system should tally with the user wise report, tallying long book with the system, veryfying physical cash with the system and in case of any discrepancy sucurity camera might be checked. and as per Internal Audit Policy to have a control on each department we have 8 rules of Controls which are SPAM SOAP (segregation of duties, physical, authorization, management, supervision, organization, Arithmetical and accounting and Personal (recruitment and training controls).