6.1. Measurement methods
Here, six planning process variables and five
effectiveness dimensions of SISP were assessed. As
noted by Churchill [14], the researcher should use or
adapt existing measurement scales, and when scales
have yet to be developed, literature may be used to
determine how the variable has been defined and how
many dimensions or components it contains. Then, a
V. Grover, A.H. Segars / Information & Management 42 (2005) 761–779 767
Fig. 1. Strategic IS planning stages.
panel of experts (i.e., those knowledgeable in the area)
should offer valuable ideas and insights into the
phenomenon. Within our study, each of these
mechanisms was employed in developing construct
measures. In addition, the Q-sort technique [51], in
which experts and typical respondents group items
according to their similarity, was used to establish
construct validity. It was conducted among a panel of
senior IS executives and academics as a means of item
purification. Correct classification rates of over 90%
were realized for 80% of the initial items; these were
retained for further analysis.