Ease of Modification & Lead-time Factors

Ease of Modification
The design should lend itself to variations, multiple sizes or parametric modification. A parametric design is a way of linking dimensions and variables to a created geometry in a way that can be scaled. The values might change and in turn this will change and affect the entire design. The parametric itself is the variable that all other variables are related too. This allows for extremely quick modification to a single part and thus affecting and entire object. An end consumers requests and specifications can then be easily made. Tasks like changing chair heights, table widths, etc., should be a relatively simple procedure.
Lead-time Factors
Lead-time is the number of days or weeks it takes from the point of purchase to when the product is ready to ship or deliver. The choices you make as a designer can effect the lead-time. Availability of materials and processes is the first step in understanding lead times for a given design. Regionally some materials and or processes might be more readily available than others. If you need to special order from a specific distributor you need to know the order timelines and minimum quantities. If you are specifying something exotic and only need a small quantity, the pricing can be high and the timing long. Also the number of processes your object will need and the complexity of the processes will affect the lead-time.