Detailed Design Document (Modify Route List)

Modifying the customer route list is described in the above diagram. The user enters two numbers to the system that correspond to the current position of the customer that is to be moved in the list, and the new position in the list for this customer. Customers are retrieved from the Customer datastore and the position in route list ordering is changed as reflected by the user's inputted information. The customers are then written back into the datastore.

The returned status corresponds to the success of the operation. If the ordering of the customers in the route list is successfully modified, the status returns Successful. If the system is unable to modify the list according to the user's inputted information, the corresponding error message is returned.

P-Spec

Process ID	1.A.6
Process Name	Modify Route List
Inputs	new position, current position
Outputs	None
Permissible User	Administrator, Salesperson
Assumptions	All information entered is syntactically correct.
Error Conditions	The current position entered is not valid. The new position entered is not valid.

Data Elements (Data Dictionary)

Name	current position
Kind	Data movement in DFD
Type	Integer
Description	Specifies the current position of a particular customer in the route list of the user. This number is used to move a customer to a new position in the user's route list.

Name	customers
Kind	Data movement in DFD
Type	Instance of an Entity
Description	This data element corresponds to one or more complete instances of the Entity Customer.

Name	new position
Kind	Data movement in DFD
Type	Integer
Description	Specifies the new position of a particular customer in the route list of the user. This number is used to move a customer from the current position in the user's route list.

Name	status
Kind	Data movement in DFD
Type	Return Message
Description	This data element corresponds to an error message being returned from an operation. An error message may be both successful and unsuccessful. Unsuccessful error messages are further subcategorized into different errors based on the possible errors that can occur in an operation.