1. Measure and Manage Flow in Practice
by
Zsolt Fabok
2012.10.18
Broke the WIP limit TWICE
Still on the team
@ZsoltFabok #lkfr12
http://zsoltfabok.com/ http://lkfr.org/
2. 5 Stories from the life of a team by using
real application and data
The collected data is the courtesy of Digital Natives
16. CFD was not much help here...
lead time
...because we didn’t know much about
the nature of the lead time
17. Distribution of lead times
count
15
13
10
8
5
3
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 22 28 33 56
days
average
*Calculation of medians is a popular technique in summary statistics and
median* summarizing statistical data, since it is simple to understand and easy to calculate,
while also giving a measure that is more robust in the presence of outlier values
18. Some examples of work items with 8-day
lead time
time spent on time spent waiting
implementation (hours) %
(hours)
1 63 98
7 57 90
2 62 97
2 62 97
3 61 96
21. Distribution of lead times
Before After
count count
15 15
13 13
10 10
8 8
5 5
3 3
0 0
days 1 4 7 10 13 16 33 days 1 3 5 7 9 11 13 22
average
median
43. “If you can not measure it,
you can not improve it.”
Lord Kelvin
http://en.wikipedia.org/wiki/File:Lord_Kelvin_photograph.jpg
44. “If you start measuring
something you start
optimizing it, and I know it's
the wrong thing to optimize.”
Paul Graham
http://paulgraham.com/swan.html
47. 1. We develop software not models (value)
2. Demand first, supply second
3. Observe the system (lead time, throughput)
4. Start measuring, look back if necessary
5. Manage
6. Mind that data expires
7. Goto step 3.
48. Thank you very much for your attention!
http://zsoltfabok.com/ @ZsoltFabok