This document discusses different types of contracts used to establish business agreements. It describes fixed price contracts where a service provider agrees to complete a defined service for a set price. Unit price contracts divide projects into units that are bid separately. Cost plus contracts reimburse service providers for costs plus an agreed fee. Incentive contracts share risks between parties for uncertain projects. Retainer contracts price time and materials for long-term engagements. Percentage of construction fee contracts pay service providers a percentage of estimated construction costs. The document recommends choosing contracts with minimum risk, like fixed price for predictable short-term projects and retainer or cost plus for exploratory ones.