Hello Dustydune,
The effects of excessive overtime have been written up in several
forms. Some references are quite general such as:
http://www.computerworld.com/developmenttopics/development/story/0,10801,77681,00.html
which is an article from Computerworld written in January 2003. Scroll
down to the end for the effects of hidden overtime. Effects include
lack of new ideas, illness, and other symptoms.
http://homes.jcu.edu.au/~ccmsn/cp3110/a2/lecture_v1.html
is a portion of class notes which focuses on team productivity and has
some guidelines related to overtime at the end. Effects stated include
increased defects, reduced creativity, and burnout.
http://www.epinet.org/content.cfm/webfeatures_viewpoints_comp_time
focuses primarily on the problems of compensatory time off (comp time)
but also notes that families need predictable work hours to arrange
child care and other needs.
The references above should get you a feel for the kind of factors
that are involved. The next two are books I have found to be
particularly valuable.
Perhaps the best in depth look at overtime (and a variety of other
people related issues) is in "Peopleware: Productive Projects and
Teams" by Tom DeMarco and Timothy Lister.
http://www.dorsethouse.com/books/pw.html
The publisher has excerpts included as well as several reviews and
links to on line bookstore sites (or check your local library). Be
sure to read the excerpt "Teamicide Revisited" since it touches on
overtime in two different ways.
My copy is the first edition, where chapter 3 titled "Vienna Waits for
You" talks in depth about "Spanish Theory Management". A portion of
this has been put on line at
http://www.hackvan.com/pub/stig/rants/stig--on-work-and-slavedriving
Scroll down to the end (footnote 4) for a sample of the writing. As
another example, consider part of the chapter introduction:
"There were two divorces that he [the project manager] could trace
directly to the overtime his people were putting in, and one of his
worker's kids had gotten into some kind of trouble with drugs,
probably because the father had been too busy for parenting during the
last year. Finally there had been the nervous breakdown of the test
team leader."
There are a number of other factors that DeMarco and Lister go through
in this book. Some are quite simple such as putting the team together,
reducing interruptions, single assignments, adequate space and
resources to work in and so on. If you haven't had a chance to read it
- by all means try to do so.
A more technical look at software productivity in general, and the
effects of overtime in particular is "Software Project Dynamics: An
Integrated Approach" by Tarek Abdel-Hamid, and Stuart E. Madnick. It
is an expensive book ($74 at Amazon) and somewhat dated (1991) but it
includes a comprehensive simulation model of software development.
This book refers to "overwork" as a factor describing both overtime
and the reduction of slack time (boosting the actual fraction of man
days on project tasks). In part
"As employees work harder to handle shortages in man-days, their
tolerance for working harder decreases ....
This is described by the complementary term of Exhaustion Factor or
Exhaustion Level. The model has a nominal 50 work days for exhausting
the development team and a four week (20 work day) recovery period
where the team will refuse to overwork (after being exhausted). The
full explanation of overwork and exhaustion takes about four pages,
but the essence is as I described here.
The simulation model is based on a wide range of research - there are
over 250 publication references in it, and a number of interviews were
held at a variety of facilities. If you decide to look at this and the
model it contains, you can do a series of "what if" analyses to
determine the best approach to manage your development teams.
Citeseer also is a good resource, check out both
http://citeseer.nj.nec.com/context/301297/0
http://citeseer.nj.nec.com/context/205444/0
for references to these two books in on line papers. These other
papers should also provide some additional information if needed on
overtime and other staffing / management issues.
Another related reference:
http://www.itworld.com/Career/2019/ITW010515slack/
looking at another book by DeMarco, making some of the same kind of arguments.
Voluntary overtime is discussed in depth at
http://www.stevemcconnell.com/rdvolot.htm
which includes some nice charts showing the relationship between
distance [duration] and speed [performance] as well as describing
several drawbacks of overtime.
For more possible sources, try search phrases such as:
peopleware demarco lister
defects overtime
drawbacks overtime
overtime demarco
If you need some more ammunition, I would be glad to look for more
references if there is some specific kind of data you need beyond what
I provided. Please use the clarification request as needed.
--Maniac |