Good Morning Ralph,
How's it going? Great question. In our kind of work, we run into this though often on a bigger scale. Here are my thoughts.
Client A has asked me to do something and that's what I should bill them for. Whether I do all the work you described at once or polish it after I deliver to Client A, I would only bill them for the work they asked me to do. The polishing would be on my own time.
For future clients it's different. The more general question is if you make an investment that reduces the amount of time it takes for a consulting service, how do you bill the client going forward? If you take a class that shortens your analysis time, get a better software package for data cleansing, buy a faster computer, etc, do you bill the old number of hours or the new number of hours that it takes you? I see it as the same question.
The other aspect, of course, is your rate. If you invest more money into your skills, then (we hope!) your services become more valuable per hour and your rate can be greater. The net effect might be cheaper for the client and more for you. (Unless your fee for new clients is somehow fixed.)
I think that this approach relates to Deming's quote well, since his fee is a combination of hours and rate, which we might think of as the quantity and quality of his relative effort.
Just my two cents.
-------------------------------------------
Charles Kincaid
Engagement Director
Experis Business Intelligence and Analytics
chuck.kincaid@experis.com Webmaster
Section on Statistical Consulting
-------------------------------------------
-------------------------------------------
Original Message (with bits deleted):
Sent: 06-11-2012 17:16
From: Ralph O'Brien
Subject: Deming on consulting fees
If you are game, as you read it, consider and respond to two questions quite pertinent to statistical consulting today. Both are based on the assumption that your client requires that you bill by the day. This may also be tied to tallying time against a retainer.
1. Client A's current project calls for you to design, develop, and test a new R function, xyz.r. This is something you will likely re-use in future projects, probably for Client A and perhaps some for other clients. Therefore, you produce something more general and more polished than if you it was merely a "one-shot" tool. xyz.r takes you 3 days to complete. If this had been a one-shot tool, the effort might would have taken 2 days. How many days do you bill/tally at this point towards Client A's project?
2. Two months later, a project for Client B can make use of your xyz.r function. It needs no modification, so instead of taking 3.25 days of programming, you can do it in only 0.25 days. How many days do you tally towards Client B?
Here's the Deming piece. Note the phrase "my fee will be based on my subjective judgment of the relative effort expended on behalf of the engagement." How does this apply to the above questions?