确定过程流和任意约束的修改频率。
Capture the frequency of changes to the process flow and any constraints.
注意，使用Microsoft Access修改和添加条目时，遵守底层数据库表的约束。
Note that when modifying and adding entries using Microsoft Access, the constraints of your underlying database tables are adhered to.
物理约束(体积和密度)可能也要求修改机器设备，如汽车和飞机。
Physical constraints (mass and density) may also require modifications in machines such as automobiles and airplanes.
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