Techniques are disclosed for controlling where dynamically-added content will be positioned within the layout of a content aggregation view (e.g., for controlling where content that is created by a portlet will be rendered within a portal page). In preferred embodiments, weighting values are assigned to the portlet, and these values are used to determine the portlet's relative placement. The values may be assigned at development time, at deployment time, and/or at run time. Using disclosed techniques, content placement is more predictable and consistent, and related content can be grouped together when rendered even though that content is not simultaneously rendered.