Employment contract for a period to perform a specific task

In practice, employment contracts for a period to perform a specific task are not very popular.

The distinct feature of such an employment contract is that its duration is determined by a specific task to be done. This means that the contract names the task (e.g. prepare a financial statement), upon completion of which employment comes to an end. There is closing date like day-month-year, although the parties do need to indicate the date when the task is to be started.

A contract of that kind, if used at all, is mostly suited for works, duration of which is hard to determine in advance but which, due to their nature, may be seen as a process with the beginning and the end (e.g. harvest, seasonal works).