Three Point Estimating - Instead of using 1 approximate for each activity, 3 estimates are provided. The concept of using 3 estimates is to allow for dubiousness together with run a hazard associated amongst the activities inward a project.
- Most likely: this is the approximate that represents the most probable resources volition last assigned that tin consummate the move inward a realistic fourth dimension frame.
- Optimistic: this is the approximate that represents the fastest that the activeness tin last completed assuming no unexpected interference, run a hazard or uncertainty.
- Pessimistic: this is the approximate that represents the worst example scenario where run a hazard together with dubiousness practice delays inward activeness completion.
Advantage
-it encourages participative administration together with creates a to a greater extent than accurate approximate because of the item degree of the estimate.
Disadvantage
-it consumes a goodness amount of fourth dimension together with endeavour on the purpose of those contributing to the estimates.
Top-down estimating, including parametric, analogous, grouping determination making, together with software estimating. Top-down estimating determines costs at the projection degree or deliverable degree together with allocates costs downward to the detailed activities.
- Parametric estimating is "an estimating technique inward which an algorithm is used to calculate toll or duration based on historical information together with projection parameters." Parametric estimating tin last used when at that topographic point is a known toll per unit of measurement based on historical data.
- Analogous estimating is a "technique for estimating the duration or toll of an activeness or a projection using historical information from a similar activeness or project." Analogous estimating is a technique that tin last used past times reviewing past times similar projects. It tin solely last used if at that topographic point is ample historical information available of the actual costs of similar projects.
- Group determination making- a panel of experts are used to practice estimates via iterative facilitated consensus-building sessions. This procedure volition arrive at a toll approximate for the projection based on the consensus visit of the adept opinions from those amongst noesis together with sense inward similar type projects.
- Software estimating is a technique that uses a software parcel or programme that is driven past times projection historical information, statistical analysis and/or simulations. The software determines the approximate for a projection based on laid upwards characteristics or criteria together with estimates are analyzed past times providing a probability of success for each estimate.
-can last done fairly speedily amongst basic information virtually the project.
-can last done to render guidance inward the projection alternative procedure or inward the evolution of the Project Charter to constitute initial budgeting expectations together with requirements for the project.
Disadvantage
- is that they tend to last less accurate than bottom-up techniques. Sumber http://mechanicalgalaxy.blogspot.com/