Yahoo Content Analyst and Knowledge Engineer interview questions

4 stages during the whole interview. Approximately took about 4 hours. The first stage was the professional knowledge. One of the questions was about the comparing the difference and your preference between Yahoo Search and Google Search. It took about half an hour. The second part is the management interview. Three management from the same team interviewed me. They went through the paper from the first stage to see the answer and the opinion. Some typical interview questions would be asked during this stage by reviewing the resume. Took about one and a half hours. The third stage was the management of RD team and CAKE team. Really similar to the previous stage. Took about one and a half hours. The last stage was interviewing with the HR. Only half an hour took. Briefly introducing the company and asking for the salary expectation.