Errata for Designed for Use

#49573: Thank you, Marti; we remember fodlny Lee's gentle way of sharing his intuitive understanding of permaculture- and his kindness, which seems to be a trait shared by all of his family his effect ripples on.--mjmHAakmlhvBZiaWP

#50705: As someone suggest the formula in the book is not good BTW the exact formula it should be:

MT= a + b * log2(D/W + 1)

Where MT is the movement time it takes to move between two spots, which is what we’re trying to figure out. Variables a and b are the intercept and slope, respectively, which are usually determined experimentally. D is the distance between the origin and the target. W is the width of the target.--Fabrizio Di Carlo

#47589: "The formula for the ID is logarithmic" cannot be the cause of the statement that follows, because log only amplifies its argument if it is <1; the +1 removes that possibility.

Rather, size changes are amplified because size is a divisor. So if it is 0.5, changing it to 0.4 is just as effective as changing it from 500 to 400, and ID approaches infinity as size approaches 0.--Stephen Compall