$12$ Write a note on the tool and techniques that can be used to handle uncertainties in a project.

$13$ The sale of a product in the last six month from May are $1000$ units, $1100$ units, $1500$ units, $1600$ units, $1800$ units and $2000$ units respectively. The forecast used to be made using moving average method. Do you think the method is appropriate? If not what other models will you suggest? Explain.

$14$ Write a note on cost slope of a critical activity.