根据该报告解释，“估价假设分为一般假设和特殊假设。其中特殊假设是指未定事项假设、背离事实假设、不相一致假设、依据不足假设四个假设。” “【未定事项假设】是估价所必需的尚未明确或不够明确的土地用途、容积率等事项所做的合理的、最可能的假设。”

看Uniform Standards of Professional Appraisal Practice (USPAP)解释，提到 general assumption, extraordinary assumption, hypothetical condition。 EA 指an assignment-specific assumption as of the effective date regarding uncertain information used in an analysis which, if found to be false, could alter the appraiser’s opinions or conclusions。

A hypothetical condition assumes a condition which is known to be contrary to fact whereas an extraordinary assumption assumes a condition or a fact which is merely unknown or uncertain.

从英文解释来看，个人认为未定事项假设是extraordinary assumption, 背离事实假设 hypothetical condition