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Just in order to help you in studying for the exam (I guess is what you are doing) please take a look to the definitions then put your answer here.
The two are related but one way to differentiate OPAs and EEFs is the former can (usually) be printed whereas the latter exist and will influence/impact projects but may not be in a tangible form.
When looking for a potential seller, we'd consult the preapproved seller list but we'd need to confirm their availability before we would proceed too far with them.
Not sure if I have missed interpretation of your response.
A list of preapproved sellers is not a resource such as materials, equipment or people's time. It IS an asset but once you have identified a potential seller, the availability of their resources will be an EEF which could help or hinder your project.
"APPROVED PROVIDERS" refers to many providers that are available in the market that are considered, by organization, to be good candidates for executing projects, and the selection of specific suppliers will be done based on each project's context. And as a result, PMBOK 6 pg38 lists "Approved providers" as an EEF's factor. Do you a gree with that? When we start a project, beside EEF's factors, we also look at OPA's factos (Knowledge base, Processes, Procedures, Artifacts, and Lessons learned), in which Artifacts and Lessons learned come from previous projects; you know that "Preapproved seller lists" are specific lists, that have been properly vetted, and are Artifacts from previous projects, and of course by definition such kinds of lists are belong to OPA. For example, for one construction material we have a list of providers but when executing a project, we choose only one provider from the suggested list to supply that material for out project. In conclusion, a general list of Approved Providers is an EEF and a specific list (an Artifact) of preapproved providers (have been properly vetted from previous project) is an OPA.
The heading (topic) should actually be pre-approved Sellers list: OPA or EEF?
Sometimes PMBOK creates confusion than clarity.
There is a thin difference in the Context in both the cases.
PREAPPROVED SELLER as OPA:
This is a list of sellers which will readily usable for any procurement.
During planning, you will be able to consider this supplier to fully satisfy your requirements.
Resource availability as EEF:
Resource availability will be the moment of truth once you proceed procurement. They may have following limitations:
- contracting and purchasing constraints: Not delivering in a particular area where you have the project
- APPROVED PROVIDERS and subcontractors: Is the agency itself authorized or not at that particular time? say, we are in US and we had an approved supplier in Venezuela. He is all capable. But one fine day, it was blacklisted, so, we dont have that option.
- Collaboration agreements: Do we get any specific discounts by the virtue of our collaboration? or Do we have any unfavourable limits getting imposed because of the collaboration agreements. Say, we have Air Canada as travel partner, then although we may get discounts, in return, company will have to do a certain business period.
I hope it clarifies.
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