First Round Interview: Brief telephone interview with head of HR - who was pleasant and friendly. Asked why Deloitte, Why Consulting, What my particular business unit.
Second Round Interview: Group Interview
This was a case study with a table full of other candidates and two facilitators (there were a few such tables in one conference room).
Day began with an introduction to Deloitte, then an individual case study, group case study, then one-on-one interview with facilitators/managers.
Make sure you engage with the team and participate but do not dominate conversation.
It is important to build rapport with the team and managers and establish yourself as a good team player.
One-on-one interview - think about why you want to be in that particular business unit compared to others, what has brought you to this point, why you applied for the role, what you will do if you don't get the role.
Third Interview: Case Studies & Partner Interview
Two Case Studies - make sure you have read up on market sizing and case study questions, calculating break even and make or buy examples. Use the interviewer as they are employees in your business unit and will be able to help / they are assessing you the whole time to see if you are someone they want to work with.
Partner Interview - more of an informal chat. Think about your strengths and weaknesses, and try to anticipate any questions that they may have about your weaknesses. The partner was friendly but professional and will definitely pressure test you with any questions or queries that you have - gaps in your resume, education, experience, approach.
Think about the other jobs that you are applying for and will apply for - what key competencies or interests do you have that are similar. Eg - what are your interests, strengths, deliverables.
Where do you see yourself in five years? How would your parents/friends/colleagues describe you?
Between the case studies and partner interview also take some time to gather your thoughts and process your experience in the case studies. The partner will probably ask you how you think you went and any challenges you faced. This is your opportunity to show your self-awareness and development so definitely take a minute or two between interviews to process this.