Carney Curve

Boston College course evaluations · every published number, ranked class by class

Top of the board1.ECON 9902962.LAWS 8856973.PRTO 3300984.BSLW 2299975.PHIL 4932986.LAWS 8308987.SCWK 9960998.EESC 99011009.MUSP 16609610.UGMG 10109811.UNCP 55119712.SCWK 883197

Positions account for how many records stand behind each number, so one perfect review does not outrank a semester of them. Every score shown is the real average — only the ordering is adjusted.

Instructor record · History · Fall 2021 – Spring 2026

Yajun Mo

Associate Professor · History · 14 evaluation records across 6 classes

On each class's board
HIST 4049only instructor on recordHIST 2051only instructor on recordHIST 4048only instructor on recordHIST 4076only instructor on record ProvisionalHIST 10066th of 8 instructors ProvisionalHIST 4047only instructor on record Provisional
What the overall is made of
81BC evaluations14 records · weight ×1.0 · Fall 2021 – Spring 2026
90RateMyProfessors6 ratings · weight ×2.0 · 83% would take again
—Student reviewsno reviews — does not contribute

Sources are averaged by how much we trust each one and by how many records sit behind it, so a handful of reviews nudges the number rather than replacing it.

What the challenge rank is made of
66thMore challenging than 66% of BC instructorsranked against every one we hold
90BC — “Intellectually Challenging”14 records · raw score out of 100

Boston College's own “intellectually challenging” question — students answer it positively about courses that stretched them, so it measures intellectual challenge and NOT grading, workload or quality. Almost every BC class scores high on it, which is why it is shown as a rank rather than a score. RateMyProfessors separately rates this instructor 56 out of 100 for difficulty — that IS a difficulty measure, but it is about the person across everything they teach, not about any one class, so it is shown here rather than folded into the number above.

What the workload rank is made of
80thMore work than 80% of BC instructorsranked against every one we hold
60BC — “Workload”14 records · raw score out of 100

Boston College reports workload as one of five bands, not as a number of hours, and it does not publish what the bands mean — so this site will not translate it into hours. Higher means more work, which is not the same as worse.

Ratings from outside BC

Not evaluation data

Collected from RateMyProfessors, not from Boston College: 6 ratings, 83% would take again, difficulty 56 out of 100. Difficulty is not a quality signal in either direction — a harder course is not a worse one.

Anyone can post there — no @bc.edu check and no enrolment check — so it is weighted alongside the evaluation data, never above it.

The line

All 13 items · means across 14 records
The Professor4 items
Clearly Explains MaterialThe instructor was effective at creating an understanding of difficult subject matter.
8621st pctl
Available Outside of ClassThe instructor was available for help outside of class.
9037th pctl
Brings Out Your Best WorkThe instructor motivated me to do my best work.
8623rd pctl
Sparked My InterestThe course stimulated my interest in the subject matter.
8930th pctl
The Course3 items
Well-Organized CourseThe course was well organized.
8841st pctl
Clear Learning GoalsThe learning objectives for the course were clear.
8731st pctl
Useful Beyond the CourseWhat I learned is applicable beyond this course.
8942nd pctl
Assignments & Feedback3 items
Assignments Help You LearnAssignments and exams contributed to my learning.
8737th pctl
Gives Feedback PromptlyI received feedback on my work in a timely manner.
757th pctl
Meaningful FeedbackThe feedback I received on my work was meaningful.
7910th pctl
Workload, difficulty & attendanceNot ratings
WorkloadHow much work the course took outside class, on Boston College's five-band scale — the band boundaries are not published, so this is not a number of hours.
6080th pctl
Intellectually ChallengingThe course was intellectually challenging.
9066th pctl
Attendance MattersAttending class was necessary to do well in this course.
9057th pctl

Bar length is the rank against every comparable record we hold, not the raw score: BC's questions all have a median around 4.5, so a raw-scale bar would be nearly full on every row and would tell you nothing. Every bar is one ink colour — nothing here is graded green or red. The hatched bars are not ratings at all: a higher number on either describes a different course, not a better one.

Class by class

6 classes · 14 sections

How each position is worked outPositions account for how many records stand behind each number, so one perfect review does not outrank a semester of them. Every score shown is the real average — only the ordering is adjusted.

HIST 4049 Farewell to Revolution: Post-Mao China through FilmOvr80Chal40thWork78th
On this class's boardonly instructor on record

4 sections on record · course itself rated 77 out of 100. See the full board for HIST 4049.

TermSecInstrCourseWork
Spring 202601636560
Fall 2023018476—
Fall 202201838360
Fall 2021019084—
All 13 items for HIST 4049
The Professor4 items
Clearly Explains MaterialThe instructor was effective at creating an understanding of difficult subject matter.
838th pctl
Available Outside of ClassThe instructor was available for help outside of class.
8921st pctl
Brings Out Your Best WorkThe instructor motivated me to do my best work.
8410th pctl
Sparked My InterestThe course stimulated my interest in the subject matter.
8714th pctl
The Course3 items
Well-Organized CourseThe course was well organized.
8831st pctl
Clear Learning GoalsThe learning objectives for the course were clear.
8414th pctl
Useful Beyond the CourseWhat I learned is applicable beyond this course.
8719th pctl
Assignments & Feedback3 items
Assignments Help You LearnAssignments and exams contributed to my learning.
8726th pctl
Gives Feedback PromptlyI received feedback on my work in a timely manner.
652nd pctl
Meaningful FeedbackThe feedback I received on my work was meaningful.
8110th pctl
Workload, difficulty & attendanceNot ratings
WorkloadHow much work the course took outside class, on Boston College's five-band scale — the band boundaries are not published, so this is not a number of hours.
6078th pctl
Intellectually ChallengingThe course was intellectually challenging.
8940th pctl
Attendance MattersAttending class was necessary to do well in this course.
9043rd pctl

Bar length is the rank against every comparable record we hold, not the raw score: BC's questions all have a median around 4.5, so a raw-scale bar would be nearly full on every row and would tell you nothing. Every bar is one ink colour — nothing here is graded green or red. The hatched bars are not ratings at all: a higher number on either describes a different course, not a better one.

HIST 2051 Modern China HistoryOvr80Chal41stWork43rd
On this class's boardonly instructor on record

3 sections on record · course itself rated 78 out of 100. See the full board for HIST 2051.

TermSecInstrCourseWork
Spring 202601858240
Spring 202301758160
Fall 202101817060
All 13 items for HIST 2051
The Professor4 items
Clearly Explains MaterialThe instructor was effective at creating an understanding of difficult subject matter.
8820th pctl
Available Outside of ClassThe instructor was available for help outside of class.
9134th pctl
Brings Out Your Best WorkThe instructor motivated me to do my best work.
8616th pctl
Sparked My InterestThe course stimulated my interest in the subject matter.
8818th pctl
The Course3 items
Well-Organized CourseThe course was well organized.
9044th pctl
Clear Learning GoalsThe learning objectives for the course were clear.
8935th pctl
Useful Beyond the CourseWhat I learned is applicable beyond this course.
8820th pctl
Assignments & Feedback3 items
Assignments Help You LearnAssignments and exams contributed to my learning.
8518th pctl
Gives Feedback PromptlyI received feedback on my work in a timely manner.
714th pctl
Meaningful FeedbackThe feedback I received on my work was meaningful.
776th pctl
Workload, difficulty & attendanceNot ratings
WorkloadHow much work the course took outside class, on Boston College's five-band scale — the band boundaries are not published, so this is not a number of hours.
5343rd pctl
Intellectually ChallengingThe course was intellectually challenging.
8941st pctl
Attendance MattersAttending class was necessary to do well in this course.
8936th pctl

Bar length is the rank against every comparable record we hold, not the raw score: BC's questions all have a median around 4.5, so a raw-scale bar would be nearly full on every row and would tell you nothing. Every bar is one ink colour — nothing here is graded green or red. The hatched bars are not ratings at all: a higher number on either describes a different course, not a better one.

HIST 4048 Modern Girls: The Woman Question in Twentieth Century ChinaOvr91Chal81stWork81st
On this class's boardonly instructor on record

3 sections on record · course itself rated 90 out of 100. See the full board for HIST 4048.

TermSecInstrCourseWork
Fall 202501939360
Spring 202301888560
Spring 202202919180
All 13 items for HIST 4048
The Professor4 items
Clearly Explains MaterialThe instructor was effective at creating an understanding of difficult subject matter.
9451st pctl
Available Outside of ClassThe instructor was available for help outside of class.
9453rd pctl
Brings Out Your Best WorkThe instructor motivated me to do my best work.
9453rd pctl
Sparked My InterestThe course stimulated my interest in the subject matter.
9551st pctl
The Course3 items
Well-Organized CourseThe course was well organized.
9251st pctl
Clear Learning GoalsThe learning objectives for the course were clear.
9250th pctl
Useful Beyond the CourseWhat I learned is applicable beyond this course.
9885th pctl
Assignments & Feedback3 items
Assignments Help You LearnAssignments and exams contributed to my learning.
9575th pctl
Gives Feedback PromptlyI received feedback on my work in a timely manner.
8832nd pctl
Meaningful FeedbackThe feedback I received on my work was meaningful.
797th pctl
Workload, difficulty & attendanceNot ratings
WorkloadHow much work the course took outside class, on Boston College's five-band scale — the band boundaries are not published, so this is not a number of hours.
6781st pctl
Intellectually ChallengingThe course was intellectually challenging.
9681st pctl
Attendance MattersAttending class was necessary to do well in this course.
9990th pctl

Bar length is the rank against every comparable record we hold, not the raw score: BC's questions all have a median around 4.5, so a raw-scale bar would be nearly full on every row and would tell you nothing. Every bar is one ink colour — nothing here is graded green or red. The hatched bars are not ratings at all: a higher number on either describes a different course, not a better one.

HIST 4076 Democracy Movements and Contemporary ChinaOvr79Chal79thWork93rd
On this class's boardonly instructor on record Provisional

2 sections on record · course itself rated 80 out of 100. See the full board for HIST 4076.

TermSecInstrCourseWork
Fall 2023018583—
Fall 202201737880
All 13 items for HIST 4076
The Professor4 items
Clearly Explains MaterialThe instructor was effective at creating an understanding of difficult subject matter.
773rd pctl
Available Outside of ClassThe instructor was available for help outside of class.
9240th pctl
Brings Out Your Best WorkThe instructor motivated me to do my best work.
838th pctl
Sparked My InterestThe course stimulated my interest in the subject matter.
8713th pctl
The Course3 items
Well-Organized CourseThe course was well organized.
8831st pctl
Clear Learning GoalsThe learning objectives for the course were clear.
8519th pctl
Useful Beyond the CourseWhat I learned is applicable beyond this course.
8820th pctl
Assignments & Feedback3 items
Assignments Help You LearnAssignments and exams contributed to my learning.
8830th pctl
Gives Feedback PromptlyI received feedback on my work in a timely manner.
756th pctl
Meaningful FeedbackThe feedback I received on my work was meaningful.
776th pctl
Workload, difficulty & attendanceNot ratings
WorkloadHow much work the course took outside class, on Boston College's five-band scale — the band boundaries are not published, so this is not a number of hours.
8093rd pctl
Intellectually ChallengingThe course was intellectually challenging.
9579th pctl
Attendance MattersAttending class was necessary to do well in this course.
9355th pctl

Bar length is the rank against every comparable record we hold, not the raw score: BC's questions all have a median around 4.5, so a raw-scale bar would be nearly full on every row and would tell you nothing. Every bar is one ink colour — nothing here is graded green or red. The hatched bars are not ratings at all: a higher number on either describes a different course, not a better one.

HIST 1006 Asia in the World IIOvr68Chal9thWork25th
On this class's board6th of 8 instructors Provisional

1 section on record · course itself rated 61 out of 100. See the full board for HIST 1006.

TermSecInstrCourseWork
Spring 202221686140
All 13 items for HIST 1006
The Professor4 items
Clearly Explains MaterialThe instructor was effective at creating an understanding of difficult subject matter.
783rd pctl
Available Outside of ClassThe instructor was available for help outside of class.
762nd pctl
Brings Out Your Best WorkThe instructor motivated me to do my best work.
731st pctl
Sparked My InterestThe course stimulated my interest in the subject matter.
772nd pctl
The Course3 items
Well-Organized CourseThe course was well organized.
8011th pctl
Clear Learning GoalsThe learning objectives for the course were clear.
8212th pctl
Useful Beyond the CourseWhat I learned is applicable beyond this course.
762nd pctl
Assignments & Feedback3 items
Assignments Help You LearnAssignments and exams contributed to my learning.
742nd pctl
Gives Feedback PromptlyI received feedback on my work in a timely manner.
756th pctl
Meaningful FeedbackThe feedback I received on my work was meaningful.
743rd pctl
Workload, difficulty & attendanceNot ratings
WorkloadHow much work the course took outside class, on Boston College's five-band scale — the band boundaries are not published, so this is not a number of hours.
4025th pctl
Intellectually ChallengingThe course was intellectually challenging.
809th pctl
Attendance MattersAttending class was necessary to do well in this course.
600th pctl

Bar length is the rank against every comparable record we hold, not the raw score: BC's questions all have a median around 4.5, so a raw-scale bar would be nearly full on every row and would tell you nothing. Every bar is one ink colour — nothing here is graded green or red. The hatched bars are not ratings at all: a higher number on either describes a different course, not a better one.

HIST 4047 Framing Modern China: A Century of Revolution and Change Through PhotographyOvr73Chal37thWork78th
On this class's boardonly instructor on record Provisional

1 section on record · course itself rated 78 out of 100. See the full board for HIST 4047.

TermSecInstrCourseWork
Fall 202501737860
All 13 items for HIST 4047
The Professor4 items
Clearly Explains MaterialThe instructor was effective at creating an understanding of difficult subject matter.
806th pctl
Available Outside of ClassThe instructor was available for help outside of class.
9237th pctl
Brings Out Your Best WorkThe instructor motivated me to do my best work.
8717th pctl
Sparked My InterestThe course stimulated my interest in the subject matter.
8818th pctl
The Course3 items
Well-Organized CourseThe course was well organized.
8522nd pctl
Clear Learning GoalsThe learning objectives for the course were clear.
809th pctl
Useful Beyond the CourseWhat I learned is applicable beyond this course.
9242nd pctl
Assignments & Feedback3 items
Assignments Help You LearnAssignments and exams contributed to my learning.
8210th pctl
Gives Feedback PromptlyI received feedback on my work in a timely manner.
8523rd pctl
Meaningful FeedbackThe feedback I received on my work was meaningful.
8727th pctl
Workload, difficulty & attendanceNot ratings
WorkloadHow much work the course took outside class, on Boston College's five-band scale — the band boundaries are not published, so this is not a number of hours.
6078th pctl
Intellectually ChallengingThe course was intellectually challenging.
8837th pctl
Attendance MattersAttending class was necessary to do well in this course.
9249th pctl

Bar length is the rank against every comparable record we hold, not the raw score: BC's questions all have a median around 4.5, so a raw-scale bar would be nearly full on every row and would tell you nothing. Every bar is one ink colour — nothing here is graded green or red. The hatched bars are not ratings at all: a higher number on either describes a different course, not a better one.

How to read this pageScores are out of 100 — Boston College's 1–5 agreement scale, ×20, the way these numbers were printed for years. Almost every class scores high on that scale (the median is about 90), so challenge and workload are shown as a rank against every instructor we hold rather than as a score; the raw figure is in the breakdown above. Neither describes quality, and neither is ever marked better or worse anywhere on this site. A dash means the question was not reported, and is never a zero. The position printed against each class is this instructor's place on that class's own board, computed from the same records the board itself is built from.