Listen for gurgling sounds in nearby drains if the toilet continues to flush slowly. These sounds, if you hear them, mean that there isn't enough air in the waste lines to allow water to flow freely. Go on the roof and clear debris from the vent opening. Once the opening is clear, spray water into it with a garden hose.
The Kimball Lifecycle. The Kimball Lifecycle is a methodology for developing data warehouses, and has been developed over many years by Ralph Kimball and a variety of colleagues.
Before you return, remember... A prototyping methodology is a software development process which allows developers to create portions of the solution to demonstrate functionality and make needed refinements before developing the final solution. Think of the annual Detroit car show where some automakers will introduce a concept car or prototype.