Od: firstname.lastname@example.org za uživatele The PM PrepCast
Odesláno: 11. května 2008 6:42
Komu: Arnost Katolicky
Předmět: Arnost, learn how to Estimate
Estimating types and ranges
There are various ways in which you can perform an estimate. Here are the
most common types:
- Estimation by expert
- Analogous Estimating
- Parametric Estimating
- Top-down Estimating
- Bottom-up Estimating
PMBOK Guide and the PM PrepCast both explain the concepts and approaches
behind these types. For the exam you not only need to know these types but
you also have to know the estimation ranges. And they are as follows:
Order of Magnitude: -25% to +75%, a Budget Estimate is -10% to +25%, a
Definite Estimate is -5% to +10% and a Final Estimate has a 0% range.
And just to emphasize: When giving a quote to a customer, you will never give
a single number (i.e. $10) you will always give a range ($8 - $12).
Until next time,
Cornelius Fichtner, PMP
The Project Management
Your project brings together team members from all over your company. Some
are from accounting, some from operations and others again from sales and
marketing. Although they report to you on questions regarding the project
they will continue to perform their usual work for their "home"
departments at 40% of the time. Never the less, it has been decided that for
the time of the project all of these team members will move their desks to
the third floor of the company's main building. What type of organizational
structure do you have on your project.
Your customer has asked you for an order of magnitude estimate. You estimate
that the project will be around $1000. What is your response to the customer?
B.) $900 - $1250
C.) $760 - $1600
D.) $1000 - $2000
C.) is correct. An order of magnitude estimate should be between -25%
to +75% of the estimated cost. C is closest to this guideline.
ScopeCreep Project Management Consultants, PO Box 863, 29300 Hazel Bell,
Silverado, CA 92676-0863, USA