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.
Agile is the methodology. Scrum is one of the Agile method or a framework that facilitates enforcing some of the Agile values. Scrum Master is a role in Scrum team. Manifesto for Agile Software Development.