# PjM - Changes in Cost Exercise A Question 3

**URL:** <https://community.blackspectacles.com/t/pjm-changes-in-cost-exercise-a-question-3/7674>\
**Category:** Project Management\
**Tags:** real-world-practice\
**Created:** [December 31, 2025, 8:27pm UTC](https://community.blackspectacles.com/t/pjm-changes-in-cost-exercise-a-question-3/7674 "2025-12-31T20:27:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![laura.lefevre.dharch](https://blackspectacles.com/uploads/images/5.png) [@laura.lefevre.dharch](https://community.blackspectacles.com/u/laura.lefevre.dharch)\
**Post date:** [December 31, 2025, 8:27pm UTC](https://community.blackspectacles.com/t/pjm-changes-in-cost-exercise-a-question-3/7674/1 "2025-12-31T20:27:51Z")

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I understand Supplementary vs. Additional Services, but why is Interior Design not an additional cost?

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**Author:** ![kiaragalicinao](https://yyz1.discourse-cdn.com/flex029/user_avatar/community.blackspectacles.com/kiaragalicinao/32/1607_2.png) [@kiaragalicinao](https://community.blackspectacles.com/u/kiaragalicinao)\
**Post date:** [January 2, 2026, 5:24pm UTC](https://community.blackspectacles.com/t/pjm-changes-in-cost-exercise-a-question-3/7674/2 "2026-01-02T17:24:08Z")

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Welcome to the Black Spectacles Community, @laura.lefevre.dharch! We are glad that you are here.

I responded to your question on the dedicated community thread for this Real-World Practice exercise. You can find it here:

> [@PjM | Changes in Cost \[Exercise A\]](https://community.blackspectacles.com/t/pjm-changes-in-cost-exercise-a/7629/2):
>
> @laura.lefevre.dharch In this exercise, you are to reference the executed AIA B101-2017 (reference provided) which indicates which supplemental services have been agreed upon and who will be providing those services, if at all. In this reference, you’ll see that § 4.1.1.10 Architectural interior design is Not Provided. This means that it was not included at the time of contract signing and if the client wishes to add it on at a later time, it will be considered an additional service. Check ou…

Just a heads up - each Real-World Practice exercise has its own community thread to ask questions and share insights. It’s also a great way to connect with peers who are studying the same division as you are. To access these threads, simply click on the _ **“Discuss in the community”** _ button when reviewing answer feedback within the specific Real-World Practice exercise.

Let me know if you have any further questions!

Kiara Galicinao, AIA, NCARB  
Product Coordinator  
**[Black Spectacles](https://www.blackspectacles.com/en-us/)**