On Tue, Jul 22, 2014 at 12:03 PM, Tudor Girba <tudor@tudorgirba.com> wrote:

Hi,

I am preparing a talk on software environmentalism (http://www.tudorgirba.com/blog/keynote-at-ecoop-2014) and I am looking for resources around the following issues:

- the amount of source code in the world

 

This is not the total amount of source code in the works, but it is a quite huge number:

IDC estimates there are more than 10,000 large IBM mainframe sites worldwide with 200 billion lines of legacy code still in use [2].

[2] Len Erlikh. Leveraging Legacy System Dollars for E-Business. IT Professional, vol. 2, no. 3, pages 17–23, 2000. 2

 

- the amount of time spent on reading code

 

Corbi estimates the portion of time invested in program comprehension to be between 50 and 60% [1].

[1] Thomas A. Corbi. Program Understanding: Challenge for the 1990’s. IBM Systems Journal, vol. 28, no. 2, pages 294–306, 1989. 2

 

- the development tools in use

- how people use custom tools (for example, unix/linux scripts)

- or other similar ones

 

Up to 90% of the total cost of software development project is spent in maintenance and evolution [2,3].

[3] Alan Mark Davis. 201 principles of software development. McGraw-Hill, 1995. 2 

Do you happen to know any pointers that go in this direction?

Cheers,

Doru

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www.tudorgirba.com

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