Appendix B: Details of
the Statistical Analysis
SUCCESS MEASURE ANALYSIS
For success, three items measured project eciency, and four measured
overall project success. All measures of success showed a high Cronbach
alpha score which shows they are all correlated. is ts with the results
of our review of the success literature and the view that all success mea-
sures are to some extent correlated (Dvir et al., 2003; Prabhakar, 2008;
Kloppenborg, Manolis, and Tesch, 2009; Zwikael and Globerson, 2006).
Table B.1 shows the results of this analysis.
Based on this result there is no strong reason to exclude any of the items.
e average is .905 and alpha will only improve marginally by deleting
project budget goals.
is also indicates that all of the factors above are interrelated to some
extent. However, we can note that the only factors close to the threshold
for removal are budget goals, scope, and time goals. ese are key compo-
nents of eciency. Scope is the lowest of this category which is in keeping
with Shenhar et al. (1997) who stated that scope was the most important
of the triple constraints for overall success.
e results of the Cronbach’s alpha analysis supported the initial
assumptions that the elements identied for measuring success (Müller
and Turner, 2007; Shenhar et al., 2001; Dvir et al., 2003; Zwikael and
Globerson, 2006) were valid measures of success for this survey and accu-
rately measured the judgments of respondents. Each variable achieved
a high alpha score greater than α = .85. In practical terms, this meant
there was a high degree of condence in the reliability and the data col-
lected through the survey, and they are accurate and meaningful for the
purposes of this research.