| Planning estimates | It is a rough order of estimate(ROM). ROM is an approximation strategy that helps project managers present important financial estimates to clients and consumers. Helps in determining the feasibility of a project and is important for the decision-making process |
| Backlog estimates | Provides data on the amount of work that isn't complete - works has started but not yet completed |
| Timebox estimates | Shows how long it might take to complete a project - important part of Agile and Lean software development. Involves subdividing a project into smaller chunks of work and estimating each chunk separately. |
| Order-of-magnitude estimates | Helps to estimate the cost and effort to complete a project - help you determine how big something is without knowing the exact value. |
| Feasibility estimates | useful when determining if a project or task is doable and how much it may cost |
| Detailed estimates | Includes several line items or categories of work for a project. You can use it to estimate the time and resources necessary to complete a project |
| Analogous estimates | uses experience to predict the time and cost required for a project. For example, if you've completed similar projects in the past and know how long each one took, you can use this information to estimate future projects |
| Top-down estimates | starts with a high-level project scope, which you simplify into smaller pieces. |