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Chapter G3 Assessment of packages
Introduction
This chapter sets out the NZTA's method of assessment for packages.
Purpose and audience
The purpose of this chapter is to provide guidance to anyone assessing a package. It may also be useful to NZTA staff advising people who are assessing packages.
Use of standard criteria and considerations
Packages are assessed using standard assessment criteria and considerations in Chapter G2 Standard criteria and considerations for assessment of improvement projects.
The resulting assessment profile applies to all activities in the package.
Update required
An update or new assessment of the package is required when either:
- any of the following have changed significantly:
- the problem, issue or opportunity
- the package maroscope
- the costs
- the impacts, or
- the package assessment is outdated (>3 years old).
Optimisation needed
Optimisation of packages is an important part of the assessment.
The contribution of an individual activity to the effectiveness and economic efficiency of the package must be assessed if the activity:
- is a large project - refer to section C9.4
- is likely to have a benefit cost ratio (BCR) around or below 2.0
- has a weak link to the rest of the package, eg when an activity is added to a package because it is in the same area and it is sensible to implement it at the same time but the activity is not related or complementary to the other activities in the package.
Use of incremental BCR analysis
In the above cases, incremental BCR analysis must be used to determine whether component activities make a sufficient contribution to justify their inclusion in the package and whether the timing of the components is optimised.
The NZTA may require incremental BCR analysis for components of other packages.
Incremental BCR not used
Where a package consists only of integrated interdependent activities, then incremental BCR analysis should not be used to test components of the package.
This is because incremental analysis would not reflect the synergy effects.
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