strategic planning

Please answer each question using at least three separate paragraphs with a citation
The Boston Consulting Group (BCG) Growth-Share Matrix portrays a corporation’s portfolio of strategic business units (SBUs) or products in four cells – stars, cash cows, question marks, and dogs. Define the terms and describe what purposes might a strategic planner use this tool for. 
Briefly explain what a force-field analysis displays and its uses in strategic planning and implementation.