3. Research design
The research model was tested with a stratified sample
of project organizations randomly extracted from the
database of the Project Management Association of Finland.
True random sampling, requiring the a priori establishment
of the population from which a sample could be drawn,
was not possible as detailed and complete public data on
projects or project managers were not available. Thus, there
is a danger that the sample will not represent the broader
population. Data were collected by a survey questionnaire
administered to 240 project managers from 145 different
project organizations.