c) Figure 3
• Shows the kinds of noises that workers are bothered by, from phones ringing (highest) to
noises outside (lowest)
d) Figure 4
• When the Speech Intelligibility Index (SII) is higher than 0.2, workers reported feeling very distracted when carrying out math and editing tasks.
• A SII lower than 0.2 is required for cognitive process to be carried out effectively.