Lateral thinking: According to de Bono, lateral thinking deliberately distances itself from standard perceptions of creativity as either "vertical" logic (the classic method for problem solving: working out the solution step-by-step from the given data) or "horizontal" imagination (having a thousand ideas but being unconcerned with the detailed implementation of them).
Edward de Bono defines four types of thinking tools:
• Idea generating tools that are designed to break current thinking patterns—routine patterns, the status quo
• Focus tools that are designed to broaden where to search for new ideas
• Harvest tools that are designed to ensure more value is received from idea generating output
• Treatment tools that are designed to consider real-world constraints, resources, and support
http://en.wikipedia.org/wiki/Lateral_thinking