# Errata

## Errata for Learning Agile

The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version Location Description Submitted By Date submitted Date corrected
Printed
Page 15
Third paragraph, third line

The word "theCir" should be "their"

Andrew Stellman

Nov 10, 2014
Printed, PDF, ePub, Mobi, , Other Digital Version
Page 305
Second bullet

The second bullet ("Mura") is missing a closing quotation mark

Andrew Stellman

Jan 24, 2015  Feb 05, 2016
Printed, PDF, ePub, Mobi, , Other Digital Version
Page 323
Second paragraph, third line

"for example)" -- change the ")" to an em hyphen

Andrew Stellman

Nov 22, 2014
Printed, PDF, ePub, Mobi, , Other Digital Version
Page 343
Diagram

I believe there is some contradictory information in the text (unless I’ve misunderstood). This is in Chapter 9 (Kanban) - summary below:

• Page 344 references Little’s Law as W = L ÷ λ. That is, the average lead time (W) is equal to average inventory (L) divided by average lead time (λ).
• The diagram in page 343 states “Little’s Law says that when a system is stable, the average lead time for all work items (W) is always equal to L times λ.” (i.e. W = L x λ). This contradicts the formula on page 344 (W = L ÷ λ).
• Page 361 has the same contradiction. The fifth bullet in the “Key Points” section states “When a system is stable, Little’s Law applies, which means that the average lead time is always equal to the long-term arrival rate times the long-term inventory.” (i.e. W = L x λ)

Apologies if I’ve misunderstood, but thought I would point it out.

Note from the Author or Editor:
Yes, there's a typo in figure 9-10 on page 343. For the production team: here's a link to a PDF of the updated diagram with the typo fixed: http://bit.ly/1Aq12se

The same typo is also on page 361 in the third bullet -- change "times the long-term inventory" to "divided by the long-term inventory"

Colin Armstrong  Feb 24, 2015  Feb 05, 2016