In the top-down approach you will estimate the duration of deliverables and/or major deliverables. In bottom-up estimating you provide detailed estimates for each individual task making up your deliverables. Generally, top-down estimating is done first and then later followed up with bottom-up estimating.
Keeping this in consideration, what is a top down estimate?
Top-down estimating occurs when company management imposes a cost and/or duration on a project, usually without a detailed cost analysis. The estimating process is derived from the opinions of a group of experienced managers, possibly supplemented by outside experts.
Similarly, when should you use bottom-up estimating? A bottom-up analysis allows managers to be more versatile, implementing strategies such as project crashing or empowering team members to assume control if need be. Bottom-up estimating can be integrated with other estimation approaches, such as three-point estimating, to further enhance the manager's effectiveness.
Similarly, why is the bottom-up approach to estimating the budget better than top down?
The Bottom-up approach is typically more reliable and preferred for estimating because it assesses each work package from the bottom, working up to a deliverable and phase. It is practical to use when project schedules and budget from previous similar projects are available for reference.
What is the difference between top down and bottom-up approach?
While the top-down approach focuses on breaking down a big problem into smaller and understandable chunks, the bottom-up approach first focuses on solving the smaller problems at the fundamental level and then integrating them into a whole and complete solution.
Related Question Answers
What are the advantage of top down approach?
The advantage of this approach is that decisions can be made and implemented very quickly. This is particularly important when time is limited. The other benefit of top-down project planning is that it helps align the project goals with the organization's strategic goals as upper management is giving the directions.What is the starting point of top down estimation?
Top Down estimating is a project estimating technique whereby the overall project is estimated first, and individual tasks are apportioned from it. You start from the top of the pyramid and work downwards.What is top down approach example?
Public Health: The top-down approach in public health deals with programs that are run by whole governments of intergovernmental organizations (IGOs) that aid in combating worldwide health-related problems. HIV control and smallpox eradication are two examples of top-down policies in the public health sphere.In which situation is a top down estimate the most appropriate?
Top-down estimating is a technique used by upper-level management to estimate the cost of a new project by using information from a previous, similar project. It's commonly used in the very early phases of a project when not much information is available.Which is the most important in managing costs?
One of the most important elements of a project cost management tool is cost estimation, which is the practice of forecasting the price of a complete project with a defined scope. There are several types of cost estimation in project management, including fixed, variable, direct, and indirect cost estimation.What are the three most common cost estimating techniques?
Below, we explore four of the most common cost estimation techniques that you can leverage.- Analogous Estimating.
- Parametric Estimating.
- Bottom-Up Estimating.
- Three-Point Estimating.
What are the 2 basic approaches used to estimate the cost of project?
There are two main approaches to take when creating a budget – top-down approach and bottom-up approach.How do you do a bottom up estimate?
5 Steps to Bottom-Up Estimating- Identify All Project Required Tasks.
- Estimate All Tasks Identified in Your WBS or Project Activity Definition.
- Identify Task Dependencies.
- Identify the Resources Required to Complete All Tasks.
- Determine When Resources Should Complete These Tasks.
What are the disadvantages of the bottom-up estimating?
The primary disadvantage of bottom-up estimating is the time it takes to complete. While other forms of estimating can use the high-level requirements used to start the project process as a basis, bottom-up estimating requires low-level components.Why would a project team decide to use a bottom-up estimate at completion?
Bottom-up estimates can be very accurate. This is because team members are estimating the piece of work they are responsible for. As they typically have the most knowledge of their work package, their estimates tend to be much more accurate than top-down estimates.Which costs are controllable by the project manager?
2) Which costs are controllable by the project manager? The project manager has the most control over direct costs. These are expenses that can be estimated or planned for during the course of the project: wages, equipment, training, meetings, transportation, publicity, advertising, etc.)How do you use top down approach?
The top-down approach to defining project tasks involves starting with the project goal or final deliverable and breaking it down into smaller planning chunks. We call them work packages. Each of these work packages or “chunks” is further refined into greater detail, and then work items are assigned to team members.What is the difference between analogous and bottom up budget estimation?
What is the difference between analogous and bottom up budget estimation? In the Estimate Activity Resources, we use the Bottom-up Estimating. In the Estimate Activity Durations, we use only Analogous Estimating. With Bottom-up being more accurate, why would it not be considered in all the processes.Why is it important to develop a good cost estimate?
Cost estimation helps you achieve what you say you're going to achieve within the financial constraints you're given by executives and stakeholders. As one of the defining features of successful progress, accurate project cost estimation must take a front seat when it comes to setting up a project's parameters.What is analogous estimating?
Analogy Cost Estimating is a technique used to estimate a cost based on historical data for an analogous system or subsystem. In this technique, a currently fielded system, similar in design and operation to the proposed system, is used as a basis for the analogy.What is a bottom-up project?
The bottom-up approach requires proactive team input in every step of the management and project executing process. The whole team is invited to share in the decisions of which course of action to take. A clear advantage of this approach is that it empowers team members to think more creatively.What are the pros and cons of the bottom up estimate?
Bottom-Up? Not So Fast| Pros | Cons |
|---|---|
| Flexibility and the capacity to deal with the unexpected | Dealing with a perceived loss of planning control by developers |
| Promotes the use of historical data and productivity measurement | |
| Typically less expensive than other estimating methods |
