The costs of direct materials are classified as: 
Definitions:
Critical Thinking
The objective analysis and evaluation of an issue in order to form a judgment.
Principle of Falsifiability
A criterion for scientific inquiry, asserting that for a hypothesis to be considered scientific, it must be inherently disprovable.
Counterevidence
Information or data that contradicts or disproves a claim, theory, or hypothesis.
Theories
Systematic sets of ideas or principles that explain phenomena and are supported by evidence.
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