broad outline
rough outline
general outline

The rough outline of the plan goes something like this.

Here is a rough outline of the countries I would like to visit.

At this stage, it could only be a rough outline.

I have not been able to do more than suggest the rough outline of this approach.

I am glad to be able to present the rough outline of it to you today.

The following is a rough outline of product release information.

I tend to believe the charts, at least in rough outline.

The second, a rough outline made public in June, proposed to balance the budget within 10 years.

He agreed to appear on the series upon reading the rough outline of the script.

Soon, the aura spread into the rough outline of a human form.