In the event that if in relation to the employee, you apply a temporary payment of labour, but want to translate it into the piece, you have to warn him about change of conditions of the employment contract two months before their entry into force. For this purpose issue a notice, the contents of which should be something like this: "due To (specify reason) hereby notify you that (write the date when the new terms) will be amended, certain parties to the conditions of concluded employment contract (indicate number and date), namely...(please list the old and new version)".
After that, notification is sent to the employee, who must sign it, signifying agreement with the above information. If a few employees, you can compose a collective letter in which each worker puts his signature opposite the name.
In that case, if the collective agreement or provision for payment of work not indicated to apply in relation to employees incentive payment for labor, and you have to make some changes. For this purpose issue the order.
Make an order and the introduction of piece-rate labor. Insert in this administrative document tariff rate or a percentage, also specify those employees affected by the change. In that case, if it is a whole unit, then list all not necessarily enough to specify the name of the Department.
Then make an additional agreement to the labour contract shall specify the method of calculating payment of labor, refer to the administrative act. This legal document make in duplicate, sign the blue seal of the organization, give to the employee for signature. Don't forget to make changes in staffing, this also will issue an order.