Control Deficiency exists when a control is missing, poorly designed, or not operating as intended, creating vulnerability to risks. Deficiencies are typically classified as minor, significant, or material weaknesses based on potential impact magnitude and likelihood. A material weakness is severe enough that financial misstatements exceeding materiality thresholds could occur and not be prevented or detected timely. For example, lacking supervisory review of journal entries represents a deficiency that could allow fraudulent financial reporting. Organizations must remediate deficiencies through control redesign, enhanced monitoring, or compensating controls. Public companies must disclose material weaknesses in internal control over financial reporting, often triggering stock price declines and regulatory scrutiny.