The Test Implementation phase is where the conceptual test designs are transformed into concrete, executable test assets. According to the ISTQB Performance Tester syllabus, this activity involves developing the test scripts that simulate user interactions. These individual scripts are explicitly referred to as the "building blocks" for the larger, more complex performance test scenarios that will be run during the execution phase. They are the foundational components upon which comprehensive load tests are constructed.

A. During test completion: This phase involves finalizing reports and archiving testware after execution is finished; no new test assets are created.

B. During test planning: This is a strategic phase focused on defining objectives, scope, and approach, not on creating tangible test scripts.

C. During test design: This phase focuses on defining test conditions and the high-level structure of tests, but not on the creation of the actual executable scripts.

1. ISTQB® Certified Tester Performance Tester Syllabus (Version 2018):

Section 3.2.4

Test Implementation: "During test implementation

the performance tester develops the test scripts that will be used to simulate the load on the system under test (SUT). These scripts are the building blocks for the performance tests." (Page 16)

This source directly uses the term "building blocks" to describe the test scripts created during the implementation phase

confirming it as the correct answer.

URL: https://www.istqb.org/certifications/performance-tester (Link to the official syllabus download page).

2. ISTQB® Certified Tester Foundation Level Syllabus (Version 2018 v3.1):

Section 1.4.3

Test Implementation: "Test implementation is the activity where test procedures or scripts are specified by combining the test cases in a particular order and including other information needed for test execution..." (Page 13)

This foundational syllabus establishes that creating scripts and test procedures is the core activity of the implementation phase

which aligns with the concept of creating "building blocks".

URL: https://www.istqb.org/certifications/foundation-level (Link to the official syllabus download page).