Gender (female = 1, male = 2)
1 = female
2 = male

Brunel staff (yes = 1, no =2)
1 = yes
2 = no

could we contact you again (no-=1, Yes=2)
1 = no
2 = yes

(Rater 1) rationale for score MP3 Player
0 = missing or not relevant
1 = Mainly negative comments, and/or improvement advice
2 = Both negative and positive comments, and/or improvement advi
3 = Mainly positive or no negative comments and no improvement

Level of Average rating player [1,3),[3,5),[5,7]
1 = low
2 = medium
3 = high

0 = At the begin
1 = At the end