A scaffold is defined as an elevated, temporary work platform. There are three basic types of scaffolds:

• Supported scaffolds, which consist of one or more platforms supported by rigid, load- bearing members, such as poles, legs, frames, outriggers, etc.
• Suspended scaffolds, which are one or more platforms suspended by ropes or other non-rigid, overhead support.
• Other scaffolds, principally manlifts, personnel hoists, etc., which are sometimes thought of as vehicles or machinery, but can be regarded as another type of supported scaffold.