If all goods on which work had been started were finished, the charges to manufacturing account would represent their exact cost, but there is always a certain quantity of goods in various stages of manufacture, and the amount already expended on them must be considered. Therefore an inventory is taken of goods in process. Great care must be exercised, in taking this inventory, that too high a value is not placed on partly finished goods, for if the valuation is too high the apparent cost of finished goods will be less than actual cost. It is of utmost importance that the cost of manufacture be not understated, for it is on this cost that selling prices will be based. This is one reason why some manufacturers add a small-factory profit. Unless a complete system of cost accounting is maintained, this inventory of goods in process must be an estimate, but the record of goods in process in each department will be of considerable assistance in making the estimate. [Illustration: Daily Report of Work in Process] When the inventory is complete the amount should be deducted from the total debits to manufacturing account, which will show the cost of goods manufactured. This cost should then be credited to manufacturing account and charged to finished goods account. Manufacturing account will now show a debit balance representing cost of goods in process. This method will produce very satisfactory results for factories in which but one line of goods is manufactured, but does not supply the information required where several styles, sizes, or lines are made. For one line of goods it is only necessary to divide the total cost by the quantity produced, as pounds, feet, dozen, or gross to find the cost of a single unit. In the more complicated business a detailed cost system would be required. PAY-ROLL RECORDS =58.= In connection with the labor account, the manner of keeping the pay-roll record is of considerable importance. Like most other forms of record, pay-roll books are made to suit the needs of the individual concern. For a manufacturing business a feature to be kept in mind is such an arrangement as will give the most complete record of the cost of labor in each separate department. Where men are never transferred from one department to another during a weekly or monthly pay-roll period, this result would be obtained by a simple grouping of the names by departments. In many manufacturing lines, however, workmen are frequently transferred so that to obtain costs for departments it is necessary to provide special forms for distribution.