In construction contracting and cost engineering, the project contractor relies on the prepared cost estimate for multiple purposes. Identify all applicable uses: submitting a competitive bid for a lump-sum contract, pricing for a unit-rate (itemwise) contract, and preparing a definitive estimate to support contract negotiations.

Introduction / Context:
Cost estimates serve many critical roles across the project life cycle, from tendering to negotiation and control. A well-prepared estimate enables contractors to price competitively, justify rates, and manage financial risk. This question checks whether you recognize the breadth of uses of an estimate in construction contracts, including lump-sum and unit-rate arrangements as well as negotiation of definitive budgets.

Given Data / Assumptions:

• An estimate is available prior to bidding and negotiation.
• Contract types considered: lump-sum and unit-price contracts.
• Definitive estimates are used to support contract discussions with the owner.

Concept / Approach:

For a lump-sum bid, the estimate aggregates quantities, productivity, and pricing to arrive at one competitive price. For unit-price contracts, the estimate underpins itemwise rates based on measured quantities. During negotiations, a definitive estimate—typically with higher accuracy and detailed backing—supports scope clarification, risk allowances, and schedule-cost alignment.

Step-by-Step Solution:

Verification / Alternative check:

Standard estimating practice recognizes conceptual, preliminary, and definitive estimates; all feed into different contracting strategies. Both lump-sum and unit-rate bids are fundamentally derived from the contractor's internal estimate.

Why Other Options Are Wrong:

• Any single-purpose choice ignores other legitimate and widely practiced uses of estimates.
• 'None of these' is false because estimates are central to all the listed tasks.

Common Pitfalls:

• Confusing conceptual and definitive estimates; the latter is more detailed and accurate.
• Transferring risk allowances incorrectly between lump-sum and unit-rate formats.

Final Answer:

All of these