Since Carpenter et al. (1980) discovered that students were lacked of basic skills aboutcomputational estimation to adapt to the necessity of practical life in 1980s, the vigorousmass of researches had appeared for computational estimation.

• 20世纪80年代,自从Carpenter等人(1980)发现学生缺乏基本必要的估算技能来适应实际生活需要后,便出现了对估算的研究热潮。