Best Practice (assessment question language): Using images and videos paired with highly thought-out objective and subjective  questions can achieve desired level of assessment.  Designing your questions with specific words elicit varying degrees of comprehension and measure competency at different levels. Check out this image of “Bloom’s Taxonomy” to help you identify which words you can use to achieve the desired level of learning from your assessment. This can help you structure your questions for the desired level of skill:

Best Practice (subjective questions): Subjective questions require more bandwidth to grade and assess BUT provide you with a wider range of tools to assess competencies and skills more concisely.  

Best Practice (assessment questions): Having a variety of subjective and objective questions, using the different “learning language” demonstrate in Bloom’s Taxonomy above can ensure a badge exam accomplishes exactly what it is designed for, which is to accurately measure the competency/skill identified.