One possible plan called plan $1$ is to maintain a constant workforce throughout the six$-$month period. A second

plan $($plan $2)$ is to maintain a constant workforce at a level necessary to meet the lowest demand month $($March$)$

and to meet all demand above this level by subcontracting. Both plan $1$ and plan $2$ have level production and

are, therefore, called level strategies. Plan $3$ is to hire and lay off workers as needed to produce exact monthly

requirements $($a chase strategy$)$