Answer:
Many to many relationship
Step-by-step explanation:
Mapping is a technique that assigns entities or variables to values. Mapping different entities and values can be described in terms of relationship. The relationship between an entity to a value can be one to one, one to many and many to many.
One to many relationship describes a mapping of one variable to many values, one to one is a mapping of one entity to one value while many to many maps many entities to an equal or unequal number of values.
The scenario in the question describes a many to many relationship in the project management.