Soybean aphid, Aphis glycines Matsumura, is established throughout Midwestern soybean, Glycine max (L.) Merrill. Multiple sampling bouts are required to estimate fluctuating densities in a single season. Since 2001, soybean aphid densities have been based on enumerative, whole-plant counts. A binomial sequential sampling plan, Speed Scouting, was created in 2004 and is a more efficient way to make treatment decisions in soybean for Agricultural Professionals. Speed Scouting was developed from field-collected data sets throughout southern Minnesota and is based on the current economic threshold of 250 aphids per plant. Replicated field plots were sampled in 2005 to validate the accuracy (percentage of correct treatment decisions) of Speed Scouting and compare this new sampling plan to enumerative counts. We compared the yield of Speed Scouting to enumerative sampling and also the average sampling time for each estimation method. To validate the application of Speed Scouting in other growing regions, replicated field plots were also sampled in Iowa, Illinois, Michigan and Wisconsin. Accuracy, yield and sampling time for each method will be discussed.