In the first phase of the study the research team identified 96 projects which could be examined as part of the Study, refer Table 2. These projects were subject to a structured sampling to ensure the overall sample was balanced, (e.g. the Traditional projects from WA, which were mainly road projects were randomly rationalized to a more representative size relative to the country as a whole).
Table 2: Phase I Projects Identified (source: Duffield 2008)
| Cwth | NSW | Qld | SA | Vic | WA | Total |
Total PPP Projects | 1 | 7 | 0 | 5 | 12 | 4 | 29 |
Total Traditional Projects | 1 | 7 | 0 | 14 | 12 | 33 | 67 |
Total Projects | 2 | 14 | 0 | 19 | 24 | 37 | 96 |
Post the rationalized sampling some adjustments of the Phase I sample were necessary to overcome difficulties in capturing adequate data from all Phase I projects. A revised set of data was sought and captured as a part of this Phase II study as detailed in Table 3.
It should also be noted that South Australia did not submit data but NT, Queensland and Tasmania provided project data as part of Phase 2.
Table 3: Phase II Data Received (source: Duffield 2008)
| Cwth | NSW | NT | Qld | Tas | Vic | WA | Total |
Total PPP Projects | 1 | 6 | 2 | 1 | 0 | 15 | 0 | 25 |
Total Traditional Projects | 1 | 10 | 4 | 0 | 7 | 17 | 3 | 42 |
Total Projects | 2 | 16 | 6 | 1 | 7 | 32 | 3 | 67 |
The representative sample size (67) is considered reasonably substantive and can be used with some confidence to illustrate national trends in infrastructure.
The sample set projects were subdivided into four categories as detailed in Table 4.
Table 4: Phase II: Projects by category (source: Duffield 2008)
Category | Traditional | Total | |
Social Infrastructure | 17 | 15 | 32 |
Transport | 19 | 4 | 23 |
Sustainability (water, waste and energy) | 5 | 3 | 8 |
Information Technology | 1 | 3 | 4 |
Total Projects | 42 | 25 | 67 |
A full list of projects included in the study is detailed in Appendix 2.
It should be noted that not all data was collected for all milestones detailed in section 3 and thus it is not possible to simply arithmetically manipulate the analysis periods as different stages may have slightly different projects included in the sample analysed due to limitations in the completeness of data provided.