in a CPM/PERT project network, the branches reflecting project operations
activity slack
in a CPM/PERT network, the amount of time that the start of an activity can be delayed without exceeding the critical path project time
adjusted exponential smoothing
the exponential smoothing forecasting technique adjusted for trend changes and seasonal patterns
analogue simulation
an original physical system is replaced with a analogous physical system that is easier to test and manipulate
analytical
containing or pertaining to mathematical analysis using formulas or equations
a priori probability
one of the two types of objective probabilities; given a set of outcomes for an activity, it is the ratio of the number of desired outcomes to the total number of outcomes
arrival rate
the number of arrivals at a service facility (within a queuing system) during a specified period of time
artificial variable
a variable that is added to an = or constraint so that initial solutions in a linear programming problem can be obtained at the origin
assignment model
a type of linear programming model similar to a transportation model, except that the supply at each source is limited to one unit and the demand at each destination is limited to one unit
average error
the cumulative error, averaged over the number of time periods
constraint so that initial solutions in a linear programming problem can be obtained at the origin 