Correcting internal control weakness

Each of the following situations has an internal control weakness.

Upside-Down Applications develops custom programs to customer’s specifications. Recently, the development of a new program stopped while the programmers redesigned Upside-Down’s accounting system. Upside-Down’s accountants could have performed this task.
Norma Rottler has been your trusted employee for 24 years. She performs all cash- handling and accounting duties. Ms. Rottler just purchased a new luxury car and a new home in an expensive suburb. As an owner of the company, you wonder how she can afford these luxuries because you pay her only $30,000 a year and she has no source of outside income.
Izzie Hardwoods, a private company, falsified sales and inventory figures in order to get an important loan. The loan went through, but Izzie later went bankrupt and could not repay the bank.