Measuring the Reliability of the Sustainable Performance Instrument in ISO 14001-Certified Manufacturing Firms in Malaysia

Abstract

This study aimed to examine the reliability of the instrument used to measure the sustainable performance of ISO 14001 firms in Malaysia, using 25 certified firms as a pilot sample. In general, the reliability of the research instrument is essential to ensure the internal consistency of the scale, which contributes to the credibility of the research. The SPSS reliability test was used to measure scales of items for every variable of the sustainable performance questionnaire, which will serve as the research instrument in the actual research. The results of the test showed a very high reliability of the instrument, with the Cronbach’s alpha (CA) value above 0.8. The high reliability of the items in the research instrument proves the high consistency of the scores generated by the instrument, rendering it highly reliable to measure the sustainable performance of firms.