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. 2020 Sep 21;22(9):1057. doi: 10.3390/e22091057

Table 2.

Number of requirements per label.

Type of Requirement Number of Requirements
Functional Requirement (FR) 444
Availability (A) 31
Legal & Licensing (L) 15
Look & Feel (LF) 49
Maintainability (MN) 24
Operability (O) 77
Performance (PE) 67
Scalability (SC) 22
Security (SE) 125
Usability (US) 85
Fault Tolerance (FT) 18
Portability (PO) 12
Total 969