Interruptions can severely degrade your performance. The type of work you are doing impacts the cost greatly. I have spent some of my time programming web applications. When I am doing that interruptions are huge drain on my performance (for me the costs of interruptions while programming are far higher than any other type of work I have done – many times higher). If the interruption disrupts my flow (an interruption needn’t necessarily disrupt it I found, instant messages may not, while speaking to someone else almost surely would – it is a factor of how much of your brain much shift focus I imagine) it can take a huge amount of time to get back into a high performing state. Other work I do can be interrupted with much less impact. I am easily able to slip back into what I was doing.
For me the main cost of interruptions is the time it takes to get back to where I was before the interruption. And the cost is related to how much focus is needed to address what you are working on. Most programming takes a huge amount of focus.
Another big cost of interruptions is the increased risk of mistakes. When people are distracted and then have to go back to a task, and then are distracted, and then go back and… it is more likely they will miss a step or miss noticing some issue than if they can work without distraction. One tool to help cope for distractions that can’t be designed out are checklists.
Paul Graham addressed the importance of managing the system to provide uninterrupted time very well in, Maker’s Schedule, Manager’s Schedule
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Most powerful people are on the manager’s schedule. It’s the schedule of command. But there’s another way of using time that’s common among people who make things, like programmers and writers. They generally prefer to use time in units of half a day at least. You can’t write or program well in units of an hour. That’s barely enough time to get started.
Paul Graham’s article also shows why managers so often fail to adequately address this issue. Manager, by and large, work in an environment where interruptions are the work. I know, much of my time as a program manager is driven by interruptions and is doable even with many interruption every day.
When managing you need to understand how big a cost interruptions have and design systems appropriate to optimize system performance for all parts of the system. The design of the system needs to take into account the costs and benefits of interruptions for those people working on various processes in the system.
Related: Understanding How to Manage Geeks – Explaining Managers to Programmers – What Motivates Programmers? – Joy in Work – Software Development – Programmers Cartoon – Checklists in Software Development



Chart showing the percentage output of top manufacturing countries from 1990-2008 by Curious Cat Management Blog,
Chart showing the output of the top manufacturing countries from 1990-2008 by Curious Cat Management Blog,
photo of (from right to left) Peter Scholtes, John Hunter and George Box in Madison, Wisconsin at the 2008 Deming Conference



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Soren Bisgaard
Posted on December 22, 2009 Comments (1)
Soren Bisgaard died earlier this month of cancer. Soren was a student of my father’s who shared the commitment to making a difference in people’s lives by using applied statistics properly. I know this seem odd to many (I tried to describe this idea previously, also read his acceptance of the 2002 William G. Hunter award). Soren served as the director of the director of the Center for Quality and Productivity Improvement at the University of Wisconsin-Madison (founded by William Hunter and George Box) for several years.
Most recently Soren Bisgaard, Ph.D. was Professor of technology management at Eugene M. Isenberg School of Management at the University of Massachusetts – Amherst. He was an ASQ Fellow; recipient of Shewart Medal, Hunter Award, George Box Medal, among many others awards.
I will remember the passion he brought to his work. He reminded me of my father in his desire to improve how things are done and allow people to have better lives. Those that bring passion to their work in management improvement are unsung heroes. It seems odd, to many, to see that you can bring improvement to people’s lives through work. But we spend huge amounts of our time at work. And by improving the systems we work in we can improve people’s lives. Soren will be missed, by those who knew him and those who didn’t (even if they never realize it).
Contributions in honor of Søren may be made to The International Mesothelioma Program or to the European Network for Business and Industrial Statistics. Read more articles by Søren Bisgaard.
The Future of Quality Technology: From a Manufacturing to a Knowledge Economy and From Defects to Innovations (pdf) by Soren Bisgaard
Related: The Work of Peter Scholtes – Management Improvement Leaders – The Scientific Context of Quality Improvement by George Box and Soren Bisgaard, 1987 – Obituary Søren Bisgaard at ENBIS – Obituary: Soren Bisgaard, Isenberg Professor in Integrative Studies
Categories: Psychology, Six sigma, Statistics
Tags: commentary, John Hunter, Madison, Six sigma, SPC, Statistics, William Hunter