Final answer:
Standardisation in test development ensures consistent administration, scoring, and interpretation of results, providing reliable comparisons across test-takers.
Step-by-step explanation:
Standardisation is the fourth stage of test development and refers to the standardization method of testing where the administration, scoring, and interpretation of results are consistent across all instances of the test. During this stage, measures are implemented to ensure that the test produces reliable outcomes which can be compared across different test-takers, regardless of when or where the test is administered. An example of this is the Stanford-Binet Intelligence Scale, which was standardized through a process called norming - providing a baseline for comparing test scores for various age groups.
Standardisation also implies that the test has been through rigorous prototyping and testing, ensuring that it meets all constraints and performs acceptably relative to established criteria. This consistent approach allows for the interpretation of results to have meaning within a defined framework, such as grade-level skills in English and math as encouraged by national standards or scientific principles that demand accurate reporting and replication of experiments.