Some materials conduct heat much better than others. Poor conductors can reduce heat loss . The technical quality of the data collected is well matched to the decisions and actions taken on the basis of their interpretation. The feature that is claimed to be measured is actually measured. An individual student's performance is similar on two or more tasks that claim to measure the same aspect of student achievement.
Students have adequate opportunity to demonstrate their achievements.
Standard C addresses the degree to which the data collected warrant the decisions and actions that will be based on them. The quality of the decisions and the appropriateness of resulting action are limited by the quality of the data. Confidence is gauged by the quality of the assessment process and the consistency of the measurement over alternative assessment processes.