Lego writing activity

I have been using Lego in the business English classroom for a number of years and am still unsure about where I first heard about the Lego precision writing activity. You will need around ten blocks for each group then have them each build a prototype, take it apart, write instructions on how to rebuild it then pass the Lego and the instructions on to another team while receiving Lego and instructions to follow themselves. More detailed instructions are available here: http://www.teachingvillage.org/2010/05/27/more-than-five-things-to-do-with-lego-in-the-efl-classroom-part-1-by-emma-herrod/