How do you model the following situation with a class diagram:On a blind date exactly two people take part. A person can take part in multiple blind dates.

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BlackTom AI · Accepted Answer

The provided data for this question is incomplete: there are no answer options to analyze. Nevertheless, we can reason about the correct way to model the described scenario and what typical options would look like.

First, restating the problem in my own words: On a blind date, exactly two people participate. A person can take part in multiple blind dates. You need a class diagram modeling this situation.

If we consider common modeling approaches, here are the typical options you might be presented with and how to judge them:

Option A (likely correct): Model two entity classes, Person and Date, connected by an association (participates in / attends). The key constraints are:
- Each Date involves exactly two Persons.
- A Person can participate in many Dates.
In UML terms, this can be represented as a many-to-many relationship between Person and Date, optionally realized with an associative (link) class called Participation. The multiplicities would express: Person to Date = * (a person can attend many dates) and Date to Person = 2 (each date has exactly two participants). The associative class (Participation) can hold additional attributes like role, order, or timestamp if needed.

Why this is a good approach:
- It cleanly expresses that one Date is linked to exactly two Persons while still allowing any Person to be linked to many Dates.
- An associative class allows capturing extra information about each participant in a given date (for example, who arranged the date, rating, etc.).

Option B (common incorrect alternative): A simple binary many-to-many relation between Person and Date with multiplicities Person * ---- * Date. This would allow any number of participants per Date, which contradicts the requirement that exactly two people take part in each Date. It also does not enforce the two-participant constraint directly, unless you add additional constraints; relying solely on a many-to-many link without a controlling element can lead to inconsistent data.

Option C (alternative but less precise): Treat Date as a binary relationship class with two Person attributes inside the Date class (e.g., partnerA and partnerB). This is a tempting but flawed approach because it hard-codes exactly two roles within Date and makes querying and extensibility harder. It defeats the flexibility of representing more complex participation data and violates good design principles by embedding participants as fields rather than as links.

Option D (another common misstep): Create two separate binary relationships like Person-to-Date (as “dates participated”) and Date-to-Person (as “participants”), but without a clear linkage or associative class. This can confuse interpretation and damages normalization; it’s essentially duplicative and does not clearly express that two people are tied to a single Date instance.

Option E (when you need to ensure two participants per date): Use an explicit associative entity (Participation) that connects Person and Date with two 1..1 or 1..2 constraints on the Date side. Each Participation instance links one Person to one Date, and for each Date there must be exactly two Participation records. This enforces the two-person-per-date rule while maintaining normalization and the ability to store per-participant details for each date.

In summary:
- The robust and scalable modeling approach is to introduce an associative class (Participation) between Person and Date (Person --< Participation >-- Date), with constraints: a Date has exactly two Participation instances, and a Person can participate in many Dates.
- A pure many-to-many link without an associative class may accidentally permit more than two participants per Date or lose the ability to store per-participation data.
- Embedding participants directly into Date (e.g., partnerA/partnerB attributes) is inflexible and harder to extend or query.

Note: If you had actual answer choices, I would map each option to these principles and indicate precisely which choice satisfies the two-person-per-date constraint while allowing individuals to participate in multiple dates.

How do you model the following situation with a class diagram:On a blind date exactly two people take part. A person can take part in multiple blind dates.

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