A well known process which consists of a coding round followed by pair programming and two technical interviews. Was sent the Conference Track Management and Guide to Galaxy problem over email. Choose CTM because of its similarity to the bin packing problem. Was very confident about the code: used Genetic algo for the scheduling, it was object oriented, handled multiple scenarios, complete with JUnit test cases. Sent the solution in two days. Get a call after three weeks. The code reviewer had trouble understanding the GA and had some issues with magic numbers. Agreed with the magic numbers bit and attributed it to lack of time at my end. Was asked to re-submit using a simpler algo which I did the next day. Nothing for a week. I send a mail enquiring about the status and get a standard reply that I haven't been selected. Since I was shocked at this outcome, I called the HR back and asked for specifics. Was told that it was 'well desgined but overengineered for a simple problem' :) I wrote them a mail explaining the rationale behind my 'overengineered' solution, thanked them for their time and moved on. ThoughtWorks is probably not for me.