Technical Data Sheet Completeness & Control Checker

The formula

This is the expression the tool evaluates. Every term is named underneath, with the unit it must be supplied in.

How the result is derived

Step by step, from the values you type to the figure on screen.

1. The 8 inputs are read from the form on every keystroke: Total Properties Listed, With a Named Test Method, With a Stated Tolerance, With Explicit Units, Approval Signatures Required, Approval Signatures Obtained, Controlled Review Interval and Months Since Last Review.
2. Each value is checked against the accepted range in the input table below. A value outside its range stops the calculation rather than producing a misleading figure — the results blank out and a message appears.
3. The validated values are substituted into the expression above, which resolves Overall Completeness together with every supporting figure in one pass — no value is carried over from a previous entry.
4. The supporting outputs — Test Method Coverage, Tolerance Coverage, Properties Missing a Method, Properties Missing a Tolerance, Approvals Obtained and Review Overdue By — come from the same pass, so they always describe the same case as the headline figure.
5. Results are rounded for display only. The full-precision value is used throughout the chain, so reading a rounded intermediate figure back into the tool by hand can shift the last digit.

What each input means

Where to read each value on the floor, the unit it must be in, and the range the tool accepts.

What the tool returns

The headline figure and every supporting value it is built from.

Worked example

The tool loads with this case already solved — the Overall Completeness shown above is its answer. Change one value and the difference from this baseline is the sensitivity of the result to that variable.

How to use it

1. Work through the input groups in order — Property Coverage and Document Control. The defaults are a realistic case, so you can change one value at a time and watch what moves.
2. There is no calculate button. Every figure recalculates as you type or drag, which is what makes this usable for a what-if sweep rather than a single answer.
3. Read Overall Completeness in the dark results panel — that is the headline figure, expressed in %.
4. Check the supporting rows underneath (Test Method Coverage, Tolerance Coverage, Properties Missing a Method, Properties Missing a Tolerance, Approvals Obtained and Review Overdue By) before acting on the headline — they are where an implausible input usually shows itself first.
5. Reset to defaults returns every field to the reference case, which is the quickest way to check whether a surprising result came from the tool or from an input you had changed earlier.

Where this is used

• Process planning — establishing Overall Completeness before a trial is booked, so machine time and material in Product Engineering, Specifications & Feasibility are committed against a calculated figure rather than an estimate.
• Costing and quotation — Overall Completeness is an input to the cost sheet, and quoting from a worked number rather than a remembered one is what keeps a margin intact.
• Troubleshooting — when the floor result drifts from plan, entering the measured values (starting with Total Properties Listed) shows how much of the gap in Overall Completeness each variable explains.
• Teaching and study — the accepted ranges bracket normal Product Engineering, Specifications & Feasibility practice, so moving one variable at a time shows the shape of the relationship rather than a single answer.

Assumptions and limits

• This counts columns; it cannot read them. A method reference that names a withdrawn standard, an obsolete revision, or a house procedure nobody can produce still scores as present, and a tolerance of "as agreed" counts the same as ±3%. Treat the score as a screen that finds blank cells, then review the filled ones. The three coverage columns are weighted equally, which flatters most sheets: units are the easiest to fill and the least often missing, while tolerance coverage is the column that decides whether a delivery can be rejected. Read that figure on its own. A negative overdue figure simply means the review is not yet due. Document control itself is a management-system requirement — under ISO 9001 an unapproved or expired specification in circulation is a nonconformity irrespective of how complete its contents are.
• Every input is bounded to the range normal practice occupies (Total Properties Listed 1 to 500, With a Named Test Method 0 to 500 and With a Stated Tolerance 0 to 500, and so on for the rest). Those bounds are guard rails against typing errors, not a claim that the formula fails one unit outside them.
• The calculation is deterministic: the same inputs always give the same result. It carries no allowance for machine condition, operator skill, ambient conditions or lot-to-lot material variation unless an input above explicitly represents one.
• Nothing is sent anywhere. The maths runs in your browser, so the numbers you type never leave the page.

Questions people ask