Looking at the shape of your organisation
Are you wanting to keep some assets but get rid of others – maybe to realise longer term assets in which you have invested excess or spare cash?
Have you accumulated a "mixed bag" of investments and a trade(s) under one roof?
Do you want to sub-divide an existing business into separate divisions and business units?
Do you have assets that you now want to use to expand overseas or has your revenue base now grown such that most of your earnings come from abroad?
Do you need to seal-off the risky from the less risky parts of the business or assets because of risk profile changes?