clock … watching time, the only true currency

A journal from John B. Roberts

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Make all usability test cash payments divisible by $20

November 13th, 2008 · No Comments

Quick note: when setting usability test cash payments, pick a number divisible by $20, so the ATM is enough. In summer sessions, we offered $125. Rounding up that $5 triggered minor pain for every session.

Lesson learned. This week, we scaled back to $120, and the money flowed like credit in 2005.

If the economy’s decline forces us to switch from cash to something more tangible (carrots?), then this advice may be abstracted as:

Set payment as easy multiple of smallest available denomination.

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