Discuss the main difference between firms and types of organisations that work in the wider UK construction sector

Discuss the main difference between firms and types of organisations that work in the wider UK construction sector.

You should discuss:
1.The sole-trader firm
2.The design office (larger limited partnerships)
3.The Private Limited Company (Ltd)
4.The Public Limited Company (PLC)
5.Direct Labour Organisation (DLO)
6.Other types of organisation(e.g. Housing Association)

The essay should not be less than 4 sides of A4 12-point word processed text ( and not more than 8 sides)