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=== Complex Tool Authorization ===
 
=== Complex Tool Authorization ===
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=== Removal of Authorization ===
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The original model where any person can authorize any other person (so-called "viral authorization") works for simple tools, but it tends to fall apart for more complex tools. Important information can get lost as authorizations spread from person to person. Area Hosts and persons experienced and active in the area have, in many cases, worked to develop standardized curricula or checklists for authorization. To this end, a number of tools (Bridgeport mill, Clausing lathe, SEM, TIG welder, knitting machines, etc.) limit the number of people who are capable of authorizing. In some cases, the Area Hosts have established prerequisite authorizations for tools. E.g. the Bridgeport mill and Clausing lathe require the "Tier 1" cold metal authorization; this guarantees mill or lathe users know how to use non-precision tools like the band saws necessary to shape metal prior to precision milling or turning, and it also introduces the user to safety information and metal cutting theory.
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Additionally, certifications never expired. A person certified two years ago on a machine who never used it since may have forgotten much of the authorization. Although not implemented, having currency and re-authorization requirements (e.g. your authorization expires if you haven't used the tool for 6 months) may make sense for certain tools.
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These requirements enhance the authorization process, but they could not be enforced under the existing Certification Policy. The proposed Authorization Policy explicitly allows them.
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=== Losing Authorization ===
    
=== Exceptions for Classes, Events, Setup, etc. ===
 
=== Exceptions for Classes, Events, Setup, etc. ===
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* Limitations on who is permitted to authorize other users.
 
* Limitations on who is permitted to authorize other users.
 
* Prerequisite authorizations a user must first obtain.
 
* Prerequisite authorizations a user must first obtain.
* Currency requirements (e.g. an authorization expires if the member has not used the tool in 6 months.)
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* Currency or re-authorization requirements (e.g. an authorization expires if the member has not used the tool in 6 months.)
    
These requirements will be communicated to the membership via the wiki or some other means and may be modified at any time.
 
These requirements will be communicated to the membership via the wiki or some other means and may be modified at any time.
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