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Lump Sum Billing in the construction industry refers to a fixed contract price for the completion of all work required for a specific project. This means that the contractor agrees to complete the whole project at a specific set cost irrespective of the amount of resources and time spent on the project. The contractor bears all the risk and is responsible for any cost overruns. Lump sum billing is commonly used in construction due to its simplicity, as the entire project is billed one time for one set amount.

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A G703 is a continuation sheet used in the construction industry. It's part of the AIA (American Institute of Architects) document set for contract documents. The G703 form includes a schedule of values listing portions of the work, scheduled values, work completed, materials stored, total completed and stored, percentage of work completed, balance to finish, and the amount of change orders. Hence, it is primarily used for breaking down the contract sum into portions of work in accordance with a schedule of values prepared by the contractor. It provides a running total of completed work and can be updated as work progresses.

Cost Plus Billing in the construction industry refers to a method where the customer agrees to cover the actual costs, expenses and other direct costs of the construction project plus an additional sum for contractor’s overhead and profit. These typically include costs of materials, labor, and subcontractor charges. The agreement clearly establishes and defines what is constituted as cost, the overhead percentage, and the profit percentage, reducing the risk of any surprise costs. Essentially, the 'Cost' represents the direct costs of the construction, while the 'Plus' is the contractor's fee and is usually agreed upon as a fixed percentage of the total costs or as a target price with a shared savings clause.