Robert Blake and Jane Mouton proposed the managerial grid model in the 1960s to analyze leadership styles. The grid depicts two dimensions - concern for production and concern for people. Different combinations of high and low scores on these dimensions define five leadership styles: impoverished management, country club management, task management, middle-of-the-road management, and team management. The model is used in grid training to help managers identify their own styles and move towards the ideal of high concern for both production and people. Some criticisms are that the model ignores external factors and there may be additional aspects of leadership not covered.