If this is for Strategy team - these used to be called Potentia. Usually business cases or creative cases to test logic, structured thinking.
I prepped with McKinsey cases, but found it to be more creative thinking rather than analytical.
With Accenture, there is a way to structure your answers, that they love, but apart from that just keep everything logical and don't jump with ideas.
It may vary from country to country, but in general it has several parts:
1) Panel discussion with a case
Panel discussion is aimed to check how well you work in a teams. Try to be nice and not push too hard. Leverage your industry eperience and case prep experience. Feel free to contact me for panel case prep
2) Market-sizing exercises on paper
Standard marketsizing cases, so make sure you prep for it.
3) 1-2 One-on-one interviews with managers that include case + fit. May be on a same or different day depending on their capacity.
One-on-one interviews are less formal and structured than in Big 3. 40% chance - marketsizing, 40% profitability, 20% standard market, company competitors, etc. framework. So prioritize your prep efforts accordingly. Also be ready for fit: Tell me about yourself, why consulting, why Accenture, leadership story, teamwork story, your questions to them