the invention consists of a method of real - time tracking of production schedules and timetables for one or more homebuilding developments , comprising : a ) assigning one or more mobile devices to one or more users associated with projects and lots , the mobile devices providing access to project and lot information , including : lots for completion for each project , tasks for completion for each lot , assignment of suppliers and material to specific tasks , projected and actual times for completion of tasks , contact information for suppliers and invoicing information for payment of purchase orders upon task completion ; and each mobile device capable of operating independently without a continuous connection to a central system ; b ) tracking performance of production tasks for each project via real - time monitoring by the users ; c ) reporting task performance data to a central erp system and comparing real - time performance of the production tasks to scheduled timetables for the production tasks ; d ) enabling modification and updating of scheduled timetables for production tasks based on performance data for the production tasks and additional real - time input from the individuals ; e ) coordinating compensation for production activities with the performance data , including enabling payment for completed tasks from the mobile devices via purchase orders ; f ) synchronizing , on a sequential basis , updates to scheduled timetables and other information between the mobile devices and the erp system .