Every answer and its explanation appears here once you have finished the path. Each one then links to the matching glossary entry, where the concept is set out in full with its worked example.
1. A project-wide policy's schedule of insureds decides three distinct things. Which?
Who can claim, against whom the insurer loses recourse, and whose knowledge of a fact binds the contract
Those three effects occur together and are decided in the same place, so adding a name for one reason never produces only one: the third surprises most, since it makes the duty of disclosure depend on people who do not know they are part of it. That is why deciding who belongs on the schedule is never purely administrative. The other answers name real parameters of the contract, none of which depends on the schedule of insureds.
Glossary entry →2. An equipment lessor becomes a co-insured on the project-wide policy. How can that reduce its own cover?
Its equipment becomes property belonging to an insured, a category policies ordinarily exclude or sub-limit
The reversal is complete and nobody sees it coming when signing the extension: the very status that protects against the insurer's recourse moves the equipment into a category the policy treats worse. That is why, on an addition request, you reread what the policy says about property belonging to insureds rather than counting the one recourse it would remove. The answer voiding its own policy invents a consequence nothing produces: both policies coexist, and it is their interplay that must be examined.
Glossary entry →3. An insured subcontractor causes damage. The insurer pays and waives recourse. What remains claimable against it?
The deductible and delay penalties, under the works contract: the waiver extinguishes only the insurer's subrogated action
The waiver removes the liability war over what the insurer paid, and nothing else: the parties keep their contractual actions between themselves, and it is precisely the heads the policy does not pay that stay in play. It is a point to settle in the works contract, because a clause putting the deductible on the responsible contractor says nothing about the case where the responsible party is not an insured, and it then falls back on whoever placed the policy. The answer extinguishing everything is the comfortable reading of the structure, and it leaves the deductible without an owner until the day it arrives.
Glossary entry →4. One insured on the project-wide policy damages another. Why does the liability section not respond?
Because the other insureds are not third parties, and liability cover responds to third parties: two successive readings are needed, property then liability
The word third party does all the work, and it is read in the definitions and not in the cover: the structure removing recourse between parties also removes their status as third parties toward one another. The practical consequence is that damage between insureds is settled by the property section or not at all, so both sections must be read in that order rather than hunting for a responsible party. Invoking the waiver, as another answer does, names a neighboring mechanism operating on the insurer's recourse after payment, not on whether cover exists.
Glossary entry →5. Should suppliers and engineering firms be included in the schedule of insureds?
It is a trade-off: they carry the design risk, and including them removes recourse against them while excluding them removes their cover; formulas built on working on site often leave them out without anyone having decided it
What matters is not the answer but that the question arises and is rarely asked: insured definitions built on working on site produce an exclusion by accident, over the very parties carrying a large project's heaviest risk. The two absolute answers miss the trade-off, one assuming breadth is free when it costs recourse, the other mistaking a drafting criterion for a rule. It is also where the definition of the insured meets the defect clause, since that definition says whether the excluded defect is the insured's or anyone's.
Glossary entry →