Estimation is the process of finding an estimate or approximation, which is a value that is usable for some purpose even if input data may be incomplete, uncertain, or unstable.

The Estimate is prediction or a rough idea to determine how much effort would take to complete a defined task. Here the effort is the time or cost. A rough idea how long a task would take to complete. An estimate is especially an approximate computation of the probable cost of a piece of work. An estimate is a forecast or prediction and approximate of what it would Cost.

The calculation of test estimation is based on:

- Past Data and Past experience
- Available documents and Knowledge
- Assumptions
- Calculated risks

**The common question is that “Why do we estimate?”**

The answer to this question is very simple, it is to avoid the exceeding time and overshooting budgets for testing activities we estimate the task.

### Software Estimation Techniques

There are some Software Testing Estimation Techniques which can be used for estimating –

- Delphi Technique
- Work Breakdown Structure (WBS)
- Functional Point Method
- Three Point Estimation

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