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pair programming twitter : @JonJagger email : [email protected] blog : http://jonjagger.blogspot.co.uk/ charity : http://cyber-dojo.org \n
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pair programming
twitter : @JonJaggeremail : [email protected]
blog : http://jonjagger.blogspot.co.uk/charity : http://cyber-dojo.org
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a seldom questioned view of programming - a view which this
book will spend a great deal of time questioning. That view is
that programming is an individual activity...
individual
from... (see slide 4)
if egoless programming is used, everyone in the group will have the opportunity to examine the work of everyone else at some time, thereby tending to prevent the establishment of strong hierarchy.
team
from... (see slide 4)
4
Written 1969
Published 1971
Silver Anniversary 1994
Golden Anniversary 2019
longest continuously in-print book on software
development?
mob programming
we were doing incremental development as early as 1957... where the technique used was, as far as I can tell, indistinguishable from XP
http://www.craiglarman.com/wiki/downloads/misc/history-of-iterative-larman-and-basili-ieee-computer.pdf
Jerry Weinberg
we worked with punch cards and printouts... with a
turnaround time of a week or so as we airfreighted decks of cards from New York to Los
Angeles.personal email from Jerry
when do developers instinctively pair?
rubber-duck debugging
https://en.wikipedia.org/wiki/Rubber_duck_debugging
silenttalking
images are representative only
productivityin my experience, pair programming is more productive than dividing the work between two programmers and then integrating the results
extreme Programming explained
pairs spent about 15% more time on the program than the individuals*
the resulting code has about 15% fewer defects
the pairs consistently implemented the same functionality in fewer lines of code
most of the programmers enjoyed programming
collaboratively
http://collaboration.csc.ncsu.edu/laurie/Papers/ieeeSoftware.PDF
strengthening the case for pair programming
Laurie WilliamsRobert Kessler
Ward CunninghamRon Jeffries
an experiment by Temple University... Professor Nosek studied 15 full-time, experienced programmers working for 45 minutes on a challenging problem, important to their organization, in their own environment, and with their own equipment.Nosek, J. T. (1998). The Case for Collaborative Programming. Communications of the ACM. March 1998: 105-108.
five worked individually, ten worked collaboratively in five pairs. Conditions and materials used were the same for both ... groups.
Nosek, J. T. (1998). The Case for Collaborative Programming. Communications of the ACM. March 1998: 105-108.
all the teams outperformed the individual programmers, enjoyed the problem-solving process more, and had greater confidence in their solutions... producing better algorithms and code in less time (40%)Results statistically significant using two-sided t-test.
if pairing increases productivity
why is it rare?
pairing is rare because working alone is common!
"locking" occurs whenever a situation creates an
environment favorable for maintaining that situation...
locking occurs in all sorts of systems... especially... social
Psychology of Computer Programming
? individual assessments ? different keyboards ? different editors ? table design ? room layout ? number of computers ? tools ...
pair programming works for XP because it encourages
communication
XP is a communal software development discipline.
communication
we are all lousy self evaluatorsSwitch by Chip and Dan Heath
feedback
programmers admit to working harder and
smarter on programs because they do not want
to let their partner downPair Programming Illuminated
energy
riskpairing helps reduce truck/bus number (aka the lottery number)
interruptionspairs are very
resistant to interruptions
interviewingteamwork characteristics cannot be determined if you interview one at a time.The Deming Route to Quality
i felt it was unwise to allow players to practice by
themselves. Always I wanted them to be interacting with their
teammates.Wooden on Leadership
interaction
the pair results were more consistent... the individuals varied more about the mean.
consistency
Pair Programming Illuminated
widespread use of pair programming involves a
cultural shift in values of the organization - away from
individual and toward team recognition and goals.
Pair Programming Illuminated
team
couragecourage is the capacity to go ahead in spite of fear, or in spite of pain.M. Scott Peck
if people program solo they are more likely to make mistakes,
more likely to overdesign, more likely to blow off the other
practises, particularly under pressure
extreme Programming explained
quality
Studies of Independence and Submission to Group Pressure. A Minority of One Against a Unanimous MajoritySolomon AschPsychological Monographs, 1956.
7 confederates 1 subject
https://en.wikipedia.org/wiki/Asch_conformity_experiments
18 trialsin trial 1 and trial 2 the
7 confederates and the subject gave the obviously right answer
in the remaining 16 trials the 7 confederates gave the same
obviously wrong answer 12 times
75% of subjects gave the incorrect answer in at least 1 trial
the subject conformed to the incorrect answer in all 12 trials
36% of the time
Studies of Independence and Submission to Group Pressure. A Minority of Two Against a MajoritySolomon AschPsychological Monographs, 1956.
presence of 1 true confederate decreased subjects conformity to the
incorrect answer by 75%
thanks for listening
twitter : @JonJaggeremail : [email protected]
blog : http://jonjagger.blogspot.co.uk/charity : http://cyber-dojo.org
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1969 1990 2004
