What is estimation (of time and effort in testing)?

Estimation in testing is the process of predicting the time, resources, and efforts required to complete a specific set of testing activities.

Goals of estimation:

• Planning testing work.
• Determining testing completion deadlines.
• Resource allocation.
• Risk assessment.

Factors influencing estimation:

• Functionality scope.
• Functionality complexity.
• Quality of requirements.
• Team experience.
• Availability of testing documentation.
• Stability of the testing environment.
• Project-related risks.
• Tools and technologies used.

Estimation methods:

• Expert judgment: Estimation based on the experience and knowledge of team members.
• Analogy: Estimation based on comparison with similar previous projects.
• Decomposition: Breaking down large tasks into smaller ones and estimating each subtask.
• Parametric Estimation: Using statistical models based on historical data.
• Three-Point Estimation: Using optimistic, pessimistic, and most likely estimates to calculate an average (e.g., PERT).
  • PERT E = (O + 4M + P) / 6

Tools for estimation:

• Jira (with plugins).
• Excel.
• Specialized project management software.

The estimation process includes:

1. Understanding the scope of work.
2. Breaking down work into smaller tasks.
3. Estimating time and effort for each task.
4. Summing estimates to obtain the overall estimate.
5. Considering risks and buffers.
6. Reviewing and agreeing on the estimate.

It is important to review and refine the estimate as the project progresses.