Items | Physical strength requirement | Requirement of information processing and decision-making abilities of the brain | Requirement of flexible operation of hands | NSs demand | Weight | Overall dimensions | Popularity degree of use | Scope of application |
Manual Ws | ● | ○ | ○ | ● | ○ | ○ | ● | ● |
Electric Ws | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ |
Motor Ws | ○ | ● | ● | ○ | ● | ● | ○ | ○ |