Do you need customer support or technical assistance? Click here to submit a support ticket...
 Page:1

# TOPIC: QuestionUsing the Bottom-up and Analogous estimating

## Using the Bottom-up and Analogous estimating 3 years 8 months ago #4292

 Ashwin Kini Topic Author Offline Fresh Boarder Posts: 16 Thank you received: 0 In the Estimate Activity Resources, we use the Bottom-up Estimating. In the Estimate Activity Durations, we use only Analogous Estimating. In the Estimate Costs, we use both Bottom-up and the Analogous Estimating. With Bottom-up being more accurate, why would it not be considered in all the processes. Or say both Analogous Estimating as well as Bottom-up Estimating used in all processes and the technique being used as per the needs? Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Using the Bottom-up and Analogous estimating 3 years 8 months ago #4293

 Cornelius Fichtner Offline Administrator PrepCast Instructor Posts: 1135 Karma: 36 Thank you received: 187 Ashwin, You use the technique that makes most sense at any given moment. If your boss asks you for a quick estimate, then you would not be using bottom up because it's not quick. And when the boss asks for a precise estimate with ranges, then you'd use a three point estimate and not analogous. Let's look at the three examplesIn the Estimate Activity Resources, we use the Bottom-up Estimating.Our task here is to estimate "who" or "what" we need to complete a task. So for example: "We need 1 database administrator to work on this task." We will be doing this for every task at the lowest possible level, so it's bottom up.In the Estimate Activity Durations, we use only Analogous Estimating.Actually... we use three forms: analogous, parametric and also three-point estimates. And one thing that most people don't realize, is the fact that parametric and three-point estimates are a form of bottom-up estimate. They allow you to make precise estimates at the lowest level. So by extension, we are in fact using a form of bottom-up estimating.In the Estimate Costs, we use both Bottom-up and the Analogous Estimating.Actually... we use four forms: analogous, parametric, bottom-up and three point estimates. It's confusing - I agree. How can you overcome the confusion? Here are three statements that may help you. They may not be 100% perfect, but they help you to remember it for the exam In Estimate Activity Resources we only want to do one thing: Determine who does the task. So we only use one technique: bottom-up. In Estimate Activity Duration we want to know how long it takes. So we have to be more precise and we use analogous, parametric and three-point. But because we are not interested in aggregating the durations, we don't use bottom-up as an explicit technique. (Aggregation happens in the next process Develop Schedule). In Estimate Activity Cost we need to be as precise as possible (because money is important), so we use all four techniques. Like I said... maybe not a 100% perfect description but it should help to jog the memory. Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable. Until Next Time, Cornelius Fichtner, PMP, CSM President, OSP International LLC Last Edit: by Cornelius Fichtner.
 Page:1
Moderators: Yolanda MabutasTimothy EnallsScott GillardMary Kathrine PaduaERIC BARTLETTKevin NasonSteven Mudrinich, PMPMark Wuenscher, PMPJohn WolvertonTracy Shagnea, PMPJada GarrettMark LacattivaPatrick Floris PhD PMPTy Weston, PMPGenevieve Pluviose, PMP

OSP INTERNATIONAL LLC
OSP INTERNATIONAL LLC
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®
Company Info
Customer Service
Resources
Exam Prep Training

Boost Your PMP Exam Prep in Only Six Hours! Join the Live PMP Coaching Class on Feb 24/25 for just \$79.
The PMP Exam is Changing in 2018
Free Interview - Listen Now

This interview with Simona Fallavollita (LinkedIn Profile) was recorded at the magnificient Project Management Institute (PMI)® Global Conference 2017 in Chicago, Illinois. We discuss the how, what, why and when of the changes that are coming to the PMP exam.

Thank you!
Cornelius Fichtner, PMP, CSM