**3.6 Step 6: Validating the prototype and refining the final multi-tier instrument**

The next step is testing the prototype multi-tier instruments to a group of students to measure its validity, reliability, distractor effectiveness, discriminatory index, and difficulty level (5 parameters). This step is also named empirical validity. Please refers to the educational evaluation and measurement references to find out the formulae to calculate these parameters. The analysis of the five parameters' values is the basis for revising the prototype and producing the final multi-tier instrument, which applies to the broader community.
