3.2.1 Target Acquisition
Task The independent variable, target size, contained three levels. The standard target size of 6.74 x 6.74 mm was based on the Apple iPhone Human Interface Guidelines [1]. The three target sizes being compared were 6.74 x 6.74 mm, 8.18 x 8.18mm and 9.50 x 9.50 mm (see Figure 1). The two larger target sizes are 20% respective 40% larger than the standard one as it was one aim of the study to show whether the user would benefit from such increases. The three target sizes will be referred to as “small” (6.74 x 6.74 mm), “medium” (8.18 x 8.18mm) and “large” (9.50 x 9.50 mm).