Change Business Process Flow Stage to Next Automatically - CRM Online 2013

Hi,

Business Process Flow allows moving to next stage by clicking 'Next Stage' button. We want it be done automatically.

For Example:  Last step in Stage A is "Identify Estimated Revenue".  When user marks this filed as complete, the stage should be automatically changed to Stage B (i.e. without user's clicking on Next Stage).

Please advise how this can be accomplished. Please also suggest any related blogs, posts or videos.

We are using CRM Online Fall '13.

Thanks in advance.