This work is primarily performed in the construction and transition phases, although it may start in the elaboration
    phase, especially where aspects of the deployment of the product are determined to involve significant architectural
    risk. This work typically begins mid-way through the iteration and may be repeated several times during the remainder
    of the iteration.
 
    This work is not considered optional, although it will differ in format, style and level of ceremony to suit the
    project context.
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