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Subject: Re: [DCHAS-L] Optimal Number of Students per TA/Instructor in General Chemistry Labs

Date: Aug 25, 2025 20:18 UTC

Author: James Kaufman <jkaufman**At_Symbol_Here**LABSAFETYINSTITUTE.ORG>

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Subject: Re: [DCHAS-L] Optimal Number of Students per TA/Instructor in General Chemistry Labs

Date: Aug 25, 2025 20:57 UTC

Author: Neufelder, Teresa M <000022237b09be0b-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>

From: Neal Langerman <chemsaf**At_Symbol_Here**GMAIL.COM>

Subject: Re: [DCHAS-L] Optimal Number of Students per TA/Instructor in General Chemistry Labs

Date: Aug 25, 2025 20:21 UTC

Reply-To: chemsaf**At_Symbol_Here**gmail.com

Message-ID: <CAOo07Zova6TQQXmYmDf1aW63h9by7nwOhG+L7fr8F3ueefJHqw**At_Symbol_Here**mail.gmail.com>

In-Reply-To: <SN6PR01MB49275434BEAAF769F4E9D8BFEE3EA**At_Symbol_Here**SN6PR01MB4927.prod.exchangelabs.com>

Demystify: 
Pat - The question is not whether the decreased supervision is safe, rather is your administration willing to accept the increased risk of an incident and the associated optics of not spending money to provide for student safety.

You can determine the current risk of the lab by looking at its history for frequency, type, and severity of incidents. You can then make an estimate - using your best judgement - of how the risk will change; that is, how frequency and severity will increase. This argument should then be presented to the Administration, from Department Chair to the Provost.

Others on this forum may be able to cite results of similar situations.

Neal

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ALERT! The email address: "neal**At_Symbol_Here**chemical-safety.com" was shut down on 31 December 2024. Please verify you are using "chemsaf**At_Symbol_Here**gmail.com". Please update your contact books.

NEAL LANGERMAN, PhD
+1 (619) 990-4908



On Mon, Aug 25, 2025 at 12:54 PM Leach, Patricia <Patricia.Leach**At_Symbol_Here**utdallas.edu> wrote:

Hello all,

We have had an explosion in the number of freshmen who are taking general chemistry this term, but funding has limited the number of TAs and instructors we have per lab room. The way the department has had to deal with this is to increase the number of students from 30 to 38 per section (limited by the Fire Marshall’s maximum occupancy of the rooms). They work in groups of 3 (not ideal at all). We have adjoining labs, so our shortage of instructors has been solved by having an instructor supervise two sections being held concurrently in a set of those labs. There is one TA per section.

 

In the past we have had 30 students (10 groups) supervised by a dedicated instructor (not working concurrent sections) and a TA, so about 15 students per person supervising. Now we can have as many as 38 students (13 groups) being supervised by one person at times, as the instructor moves between sections. I feel this is not safe.

 

What do people think is a safe ratio of supervising people to students (or student groups)?

 

Thanks,

 

Patricia Leach

Lab Manager

Department of Chemistry & Biochemistry

The University of Texas at Dallas

SLC 3.513

Office:  972-883-6583

Cell:  469-891-6426

 

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