please answer

i || || || | By: Bee-Len 00, Derek 8. Drew. and Goran Runeson Background on the article: In the construction industry. competitive bidding is used for various procurement routes available for satisfying clients' construction needs. These include traditional procurement via design-bidconstruct. and the non- traditional ones such as the design-andbuild. management contrad, and build-own-operate-transfer. Though. it should be noted that contractors do not always bid for everyjob that comes along but select from a continually changing array of potential projects. Therefore. competitive bidan in construction is concerned \\M'th contractors making strategic decisions regarding prcject selection whether or not to bid for a job and determine bid price if contractors opt to bid. It has been found in many studies that there are differences in the ranking ct factors that contractors consider when making bidfno-bid and mark-up decisions. This suggests that contractors bidding decisions are dependent on many individual rm-specific characteristics. including some that are unobserved, i.e.. the notion of heterogeneity across contractors. Gonzalez~ Diaz et al. suggest that one may think of the unobserved heterogeneity as the management ster of a construction firm. which may indude its manager's capability. the quality of its output. and its competitive strategy. Question: Based on the background given above. which research design. in your opinion. should be used in this study? Explain your