Things that give off light often also give off heat. Heat is produced by mechanical and electrical machines, and any time one thing rubs against something else. When warmer things are put with cooler ones, the warm ones lose heat and the cool ones gain it until they are all at the same temperature. A warmer object can warm a cooler one by contact or at a distance. 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.