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Bill of materials
A complete list of every material, part and component a solution needs, with quantity, size and cost for each one.
Design modification
A deliberate change to the planned design or the plan for making, made for a stated reason and recorded with its effect on the design specification.
Gantt chart
A time plan drawn as horizontal bars, where each bar is one task and its length and position show when that task starts and finishes.
Making log
A dated record kept while you build, showing what you did in each session, what went wrong and what you changed.
Plan for making
A numbered list of the steps needed to build a solution, in the order they must happen, with the tools, materials and time each step needs.
Prototype
A working version of a solution built to be tested and shown to a client, rather than a finished product made for sale.