You cannot start translation before your source texts are frozen. At the same time you must get the translation ready before your products or websites are released. The interval between the two points is the "translation window". To get the translation window under your control, you need to participate in scheduling and tracking both content authoring and content release. You will find the source texts are always being updated but the time-to-market cannot be postponed. If you take action to prevent delay of freezing the source, the translation time can be guaranteed and the quality will be assured.