Which method combines two competitive processes and is used when specifications are not adequately available?

The method that combines two competitive processes and is used when specifications are not adequately available is best represented by two-step sealed bidding. This approach is particularly effective in situations where detailed specifications for a project may not be fully established, allowing for flexibility in the procurement process.

In the first step of the two-step sealed bidding process, potential suppliers are invited to submit proposals based on a general description of the project rather than precise specifications. This encourages creativity and innovation from bidders, enabling them to suggest solutions that might not have been considered by the organization calling for bids. The second step involves inviting the most suitable candidates from the first phase to submit sealed bids based on refined specifications that are developed from the initial proposals.

This method is particularly advantageous when engaging with complex projects or emerging technologies where original specifications might evolve as discussions with competitors inform the final requirements. Thus, it strikes a balance between competition and collaboration, allowing for a more effective procurement strategy in uncertain conditions.