In order to analyse the reliability of the constructs the values of Cronbach's alpha is checked, requiring a minimum value of 0.7 as suggested by Nunnally (1978) and the composite reliability, which must be above 0.9 in all cases. Convergent validity is tested by analysing the mean extracted variance (AVE), with values for all variables above the proposed 0.5 (Straub et al., 2004). All the indicators of the measurement scales of the model have surpassed these requirement levels. Therefore, the composite reliability and convergent validity ofthese scales can be affirmed.