Rough Set Approach to Approximation Reduction in Ordered Decision Table with Fuzzy Decision

Table 1

A fuzzy decision table about investment projects 𝒯^≽_𝑑.

𝑈	𝑎1	𝑎2	𝑎3	𝑑
𝑢1	F	M	F	S
𝑢2	N	M	M	NS
𝑢3	F	F	M	VS
𝑢4	M	F	N	VS
𝑢5	N	N	M	NS
𝑢6	N	M	N	S

F: far; N: near; M: medium; S: suitable; Vs: very suitable; Ns: not suitable.