Best alternative & economic life
8.1 Proposal Relationships
Independent proposal & dependent proposal
Forms of dependency
- Co-dependent.
- Mutually exclusive.
- Contingent
8.2 Dependent Proposals
Co-Dependent Proposals
when selecting any one from that set requires accepting the others.
- These should be combined into one proposal
- e.g., Specific programming language VS Its compiler
Mutually Exclusive Proposals
A pair of proposals are mutually exclusive, when selecting one from that pair negates accepting the other.
- These should be combined into one proposal.
Contingent Proposals
A pair of proposals are contingent, when selecting one from that pair requires accepting the other, but not the other way / reverse direction.
8.3 Design Alternative: mutually exclusive units
steps
1.List alternatives
2.Remove invalid alternatives
“Do Nothing” Alternative
Alternative A0 is called “Do nothing”
"Do nothing" should always be considered, except when
- You’re required to do something
e.g., repair or replace broken equipment. - You’re working with “new project” (without income)