Your project depends on a key deliverable from a vendor you've used several times before with great success. you're counting on the delivery to arrive on June . this is an example of assumption.
Delivery assumption focus on the end, in which the project will provide the end result of why it was being done in the first place. Projects are started to enhance and or create something new, which will add value. Imagine you want to go shopping at a mall that takes one hour to reach by car. You assumed that you would leave your home at around 6:00 pm and reach the mall by 7:00 pm. This is an example of an assumption
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