The employee enters the expenses on an electronic form, which automatically calculates the totals. No delays, no calculation errors. When the employee forgets to add his signature, the form reminds him that he must do that. As soon as he is finished, the expense report goes to the boss and appears on her To Do list with a priority and due date. If the Boss forgets to review and approve it by the due date, she is prompted with a suitable warning message.
Further delays result in escalation or reassignment.
The Boss already knows that the expense is pre-approved because the expense report was generated as a part of an expense approval process. If she has a question about the expense, she can confer with the employee. He does not need to check it, because the software has already done the calculations. He approves it and also enters a check-print date in the expense report and an electronic message goes automatically to the employee informing him when the check will be printed. No missing information.