The invention is a method for picking an object from a source transport device vehicle using a mobile computer with text-to-speech software adapted for communication between a pick-by-line server and a user wherein the method entails transmitting a request from the server to the mobile computer to identify at least one source transport device from which an object is to be picked by a step, generating a summary of the objects to be picked, providing the summary using via the text-to-speech software, acknowledging receipt of the summary, identifying an object to determine if the object is to be picked, advising the user with the text-to-speech software if the object is correct, acknowledging the object has been picked, repeating these steps until all objects have been picked, providing an acknowledgement to the pick-by-line server of the results of the picking, and transferring the results from the server to the at least one external computer system.