In the first part of the group session, 42 new lid designs (e.g.,
prototype lid models) were presented; characteristics included two
diameters (25 mm and 40 mm) which represented an average
smaller diameter lid and a medium diameter lid, two heights
(10 mm and 15 mm) which represented a short and a medium
height lid, five top shapes including traditional circular and four
alternative top shapes, and eight side shapes including traditional
vertical and seven alternative side shapes. The forty-two lids
were randomly divided into three groups (fourteen lids in each)