what is likely to happen if no action is taken to suppress the infestation, and what 
might be expected to happen if suppressive measures are applied. 
Sequential sampling techniques provide for flexibility in sample size in contrast 
to conventional techniques that usually specify a fixed number of sampling units to 
be examined. Units chosen at random from a sample are examined in sequence until 
the sample falls into one or more classes distinguished by specified limits (/253). 
Sampling plans have been published for several important forest insect pests (234, 
23), 031, 032, 630, 101577 156): 
