I don't mean to burst your bubble about "Lean." (I am, after all, a charter member of the Lean Manufacturing Division of ASQ.)
I think someone is using "overkill" in ascribing this process to a "kaizen" initiative.
Simply stated, what you want and need is a brief session in "mistake proofing" to assure the workers can assemble the components of the kit without duplicating or leaving any item out of the kit.
Without seeing your operation and the various components of the kit, I can't give you a concrete plan, but I assure you that labeling of bins that hold the items or labeling of the items themselves is secondary to assuring the assembly flow reduces the possiblity of a kit assembler taking two items from the same bin or omitting one item from another bin.
Here's an example of a mistake proofing system for kitting I have seen:
there are ten total items in the kit,
but the ten include
- one each of A, B, C, D,
- two of E and
- four of F
They created TEN bins to draw from, with TWO bins of E and FOUR bins of F, so the assembler takes one from each bin instead of keeping count of how many E's or F's are drawn.
Alternately, they could have had two sub-kit lines where the TWO E items were put into a sealed package and the FOUR F items put into another package so that the final kitting line would have SIX bins, with the E and F bins filled with sealed packs of the proper quantity. This would work extremely well if E and F came from separate suppliers who could be contracted to supply the components in portion-controlled bags.
In the final analysis, does the kit assembler really need to read a label and know the part number of each item if he is dealing with either 6 or 10 bins of components?
Heck, this would be an ideal line for a blind person to work at!