title: Forrester effect mapping
text: # Forrester effect mapping
  
  The Forrester effect map is a business technique used to analyse the disturbance on the supply chain of reorder activity.
  
  The tool is one of the seven value stream mapping tools as defined by Hines and Rich.
  
  Forrester's research, (Industrial Dynamics, MIT Press 1961) showed that demand could be erratic with peaks and troughs commonplace within most organizations. These variations in requirements and supply are amplified within the supply chain when re-orders are made.
  
  ## Process
  
  The map is portrayed as a graph with a line showing elements such as customer forecasts, shipments to customers, orders for raw materials on the y-axis, over a period of time shown on the x axis.
  
  ## Results
  
  Distortion between inventory levels is shown as a result of poor communication and an inability to schedule accurately. The flatter the lines displayed the leaner the system and more accurate the forecast.
  
  