Khāṣṣ denotes a defined meaning. Yet legal results require a chain of reasoning, not merely recognition of a word.
Three qurūʾ: the number is fixed; the meaning of qurūʾ is disputed; the waiting period and its consequences are affected.
Mahr specification: the existence of the obligation differs from the determination of a minimum amount; jurists differ over the supporting evidence.
Marriage without a guardian: the Qur'anic attribution to the woman and guardianship reports are reconciled differently, affecting the validity and consequences of the contract.
Across these examples, determine the linguistic implication, assemble relevant evidence, locate the exact dispute, then derive subsidiary rulings. Accurate attribution to each school is essential.