eCAFE - Course and Faculty Evaluation, University of Hawaii

eCAFE: Course and Faculty Evaluations


Instructor: Scot Nelson

Available Survey Results

PEPS430, Spring 2014
PEPS400, Fall 2013
PEPS430, Spring 2012
PEPS660, Spring 2012

Scot Nelson: PEPS430, Spring 2014

Campus: University of Hawaii at Manoa Department: Plant & Environmtl Protect Sci
Course: PEPS 430 - Plant Disease Management Crn (Section): 85948 (001)    
1. Class Level (pick one) - please note that by answering this question you could potentially jeopardize your anonymity
Mean N-Size Std Dev   Freshman   Sophomore   Junior   Senior   Grad   Other  
5.0 2 1.41 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (50%) 0 (0%) 1 (50%)
2. Course - please note that by answering this question you could potentially jeopardize your anonymity
Mean N-Size Std Dev   Elective   Required  
2.0 2 0.0 Freq(%) 0 (0%) 2 (100%)
3. The instructor demonstrated knowledge of course content.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
4. The instructor fulfilled the goals of the course.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
5. The instructor communicated effectively.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
6. What did you like best about the course?
I enjoyed the lectures and learning about plant diseases in Hawaii which are unique and relevant to Hawaii.
LOTS of USEFUL information from an experienced professor. Knows what he is talking about and makes learning the content fun and understandable. Also, we got to publish a paper!
7. How can the instructor improve the teaching of this course?
He could make his tests less difficult
The only thing is going outside more often. He displays a lot of pictures, but if we could go outside and look at diseases in-hand, I might have had an easier time remembering things.
8. Global appraisal: Overall how would you rate this COURSE?
Mean N-Size Std Dev   Very Poor   Poor   Average   Good   Very Good  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
9. Global appraisal: Overall how would you rate this INSTRUCTOR?
Mean N-Size Std Dev   Very Poor   Poor   Average   Good   Very Good  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
10. I gained a good understanding of concepts/principles in this field.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
11. I learned to apply principles from this course to new situations.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
12. I was stimulated to do outside reading about the course material.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.5 2 0.71 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (50%) 1 (50%)
13. Which aspects of the course were most valuable?
Learning about the method behind plant disease management, and how plant diseases are being dealt with today.
The online website that consisted a lot of information. Also, the publication is forever valuable.
14. Which aspects of the course were least valuable?
I think there needs to be more assignments in order to retain the material.
NONE
15. Ten years from now I'll probably remember this course most by ...
His fascinating lectures on plant diseases and hearing about his first-hand experiences being a plant pathologist.
using the content I have learned in my career, and/or in my home garden/farm.
16. The instructor makes good use of examples and illustrations.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
17. The instructor appears to have a thorough knowledge of the subject.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
18. The instructor uses class time well.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
19. The writing assignments helped me understand the course content.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
20. Reading assignments are relevant to what is presented in class.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
21. There was considerable agreement between the announced course and what was taught.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
22. The course was well-organized in terms of continuity and presentation.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
23. Audiovisual materials (or computers) used in this course were well integrated with course topics.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 2 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 2 (100%)
24. My overall evaluation of this course is...
Excellent course and teacher, I would recommend.
Great course to take. I enjoy taking all of his courses. He has a very good way of teaching. Unlike the rest of my classes, I dont ever get bored or dose off. And, everything that is taught can be applied to everyday life.
25. State in two or three sentences how this course could be improved.
More small assignments on readings so the material could be retained.
More hands-on experience would have been helpful.
26. Other comments:
I'm very glad that I have taken this course because I have greatly expanded my knowledge on plant disease management and plant diseases specific to Hawaii. I thought the reading material was good and the lectures were very in-depth and helped me understand the complexity of plant disease management.
Great course, I hope to take more courses from him.

Scot Nelson: PEPS400, Fall 2013     Back to top

Campus: University of Hawaii at Manoa Department: Plant & Environmtl Protect Sci
Course: PEPS 400 - Plant Pest Diagnosis Crn (Section): 79201 (001)    
1. Class Level (pick one) - please note that by answering this question you could potentially jeopardize your anonymity
Mean N-Size Std Dev   Freshman   Sophomore   Junior   Senior   Grad   Other  
3.8 10 0.79 Freq(%) 0 (0%) 1 (10%) 1 (10%) 7 (70%) 1 (10%) 0 (0%)
2. Course - please note that by answering this question you could potentially jeopardize your anonymity
Mean N-Size Std Dev   Elective   Required  
1.43 10 0.53 Freq(%) 4 (40%) 3 (30%)
3. The instructor demonstrated knowledge of course content.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 10 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 10 (100%)
4. The instructor fulfilled the goals of the course.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 10 0.42 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (20%) 8 (80%)
5. The instructor communicated effectively.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.7 10 0.48 Freq(%) 0 (0%) 0 (0%) 0 (0%) 3 (30%) 7 (70%)
6. The instructor presented concepts clearly and effectively.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.5 10 0.71 Freq(%) 0 (0%) 0 (0%) 1 (10%) 3 (30%) 6 (60%)
7. I learned a good deal of factual material in this course.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.9 10 0.32 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (10%) 9 (90%)
8. I gained a good understanding of concepts/principles in this field.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 10 0.42 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (20%) 8 (80%)
9. I learned a lot in this course.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 10 0.42 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (20%) 8 (80%)
10. I developed skills needed by professionals in this field.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.6 10 0.52 Freq(%) 0 (0%) 0 (0%) 0 (0%) 4 (40%) 6 (60%)
11. Which aspects of the course were most valuable?
I think it was good to learn nutrient deficiencies as well as pest diseases so that we would be able to distinguish the two as there are several cases where symptoms are synonymous between different disease types.
I really enjoyed the mini field trips that we took during the course of this semester. It is one thing to sit in the classroom and see visual pictures that correlate to the disease, but being able to tangibly take hold of the disease and inspecting the leaves/stems helped myself to gain a better understanding of plant pest diagnosis.
Being able to determine possible causes of problems I'm having in my garden, and being able to look at a "sick" plant anywhere and come up with possible causes for it.
Gained confidence in my ability to diagnose diseases and disorders. Learned how to approach problems I don't fully comprehend: How, when and where to go to look for answers. Every PEPS and TPSS student should take this class, and its companion class, Plant Disease Management.
I learned so much about the things I see almost everyday in just this course. Now I can be more confident in saying what the plant problem is when I see it.
12. Ten years from now I'll probably remember this course most by ...
Looking at different plants and determining (or making an educated guess on) what diseases it could have.
The hard-work that was put into preparing our websites! I was preoccupied with other course work (as other students can relate) that made it impossible to feel the need to get started on the project in advance. I spent a whole week, more than 40 hours preparing that website. But I gained so much out of it! Being able to prepare a website, knowing what information to use, being organized and practice time management.
I was able to learn a lot. Not by reading books and studying my butt off, but by listening and comprehending and being able to apply it to everyday life situations.
At first blush, it is difficult to understand the meaning of plant disease signs and symptoms you see on a farm or in a landscape. He showed me the way through the woods. A very, very interesting course.
Your jokes and all the images you showed to supplement our learning.
13. The instructor gives clear explanations.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.4 10 0.7 Freq(%) 0 (0%) 0 (0%) 1 (10%) 4 (40%) 5 (50%)
14. The instructor makes good use of examples and illustrations.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 10 0.42 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (20%) 8 (80%)
15. The instructor broadened my understanding and grasp of the subject.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.9 10 0.32 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (10%) 9 (90%)
16. The instructor maintains an atmosphere of good feeling in class.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.9 10 0.32 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (10%) 9 (90%)
17. The instructor treated students with respect.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.9 10 0.32 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (10%) 9 (90%)
18. The instructor makes me feel free to ask questions.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 10 0.42 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (20%) 8 (80%)
19. The instructor encouraged class discussion.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 10 0.42 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (20%) 8 (80%)
20. The instructor was thoughtful and precise in response to questions.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 10 0.42 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (20%) 8 (80%)
21. I was able to get individual help when I needed it.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 10 0.42 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (20%) 8 (80%)
22. The instructor was consistently well-prepared and organized for class.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.9 10 0.32 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (10%) 9 (90%)
23. The instructor makes the course difficult enough to be stimulating.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.4 10 0.7 Freq(%) 0 (0%) 0 (0%) 1 (10%) 4 (40%) 5 (50%)
24. The field trips were useful learning experiences.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 10 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 9 (90%)
25. The instructor was fair in grading and criteria of grades.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.9 10 0.32 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (10%) 9 (90%)
26. Other comments:
For having taught this course for the first time, I thought Dr. Nelson did a good job at teaching the material and keeping it interesting for someone that was taking the class for general knowledge. Although I do not have an intention in the field of plant disease diagnosis (not specifically) I thought the class gave me a good amount of knowledge. It wasn't as difficult as other 400 level classes, but it was stimulating so that it did not become boring. It offered challenges as well, as creating a website was new to me.
Even though I am a senior this year and was not able to take any of Dr. Nelson's other courses prior to now, I will definitely be taking his course during the spring semester. His methodology of teaching makes students eager to learn, and his relax attitude makes you want to learn more!
I can't wait to take Pest Management next semester with you
Outstanding class. Depth and breadth of material presented in class and within the sylabus was stunning. Dr. Nelson was extraordinarily well organized and obviously cared very deeply about his performance and how well his students were picking up the material. My one suggestion for improvement would be to change his approach to the class session on how to create a Google Sites website. People learn new computer skills by doing it themselves, not by looking over the shoulder of someone as he taps away on a keyboard. Even with extensive notes from that lecture, I was lost, frustrated, and wasted an enormous amount of time fumbling around through the Google Sites instructions and explanatory YouTube videos. I would suggest the additional component to that lecture of requiring each student to come in to class that day with an idea of how they are going to organize their website, what the key categories are going to be, and have them get started IN CLASS creating the framework for their site. Otherwise, GREAT job, Dr. Nelson: I am very, very grateful that I had the opportunity to take this course from you.
Maybe a power point presentation instead of a website
Best course for my first semester here at UH. I enjoyed everything about this course and appreciated the fact that you hate exams and don't create unnecessary stress.

Scot Nelson: PEPS430, Spring 2012     Back to top

Campus: University of Hawaii at Manoa Department: Plant & Environmtl Protect Sci
Course: PEPS 430 - Plant Disease Management Crn (Section): 88573 (001)    
1. The instructor demonstrated knowledge of course content.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 6 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 6 (100%)
2. The instructor fulfilled the goals of the course.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 6 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 6 (100%)
3. The instructor communicated effectively.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.83 6 0.41 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (17%) 5 (83%)
4. I developed the ability to solve real problems in this field.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.83 6 0.41 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (17%) 5 (83%)
5. I learned a lot in this course.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.83 6 0.41 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (17%) 5 (83%)
6. I enjoyed this course.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.67 6 0.52 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (33%) 4 (67%)
7. I developed skills needed by professionals in this field.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.83 6 0.41 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (17%) 5 (83%)
8. Which aspects of the course were most valuable?
Writing extension article was the most valuable thing of this course.Practical knowledge was also given that will help us in the future.
Excellent, 'round table' style of teaching. Made for interesting and thought provoking class discussions
The website was very helpful and valuable source of information. I also enjoyed utilizing "paperless" technology to turn in assignments.
Disease management skills that can be applied in the field as an extension agent
Publication of an extension article
9. Which aspects of the course were least valuable?
nothing.
none
10. The instructor gives clear explanations.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.5 6 0.55 Freq(%) 0 (0%) 0 (0%) 0 (0%) 3 (50%) 3 (50%)
11. The instructor treated students fairly.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.4 5 0.55 Freq(%) 0 (0%) 0 (0%) 0 (0%) 3 (60%) 2 (40%)
12. The instructor encouraged class discussion.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.33 6 1.03 Freq(%) 0 (0%) 0 (0%) 2 (33%) 0 (0%) 4 (67%)
13. The instructor uses class time well.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.67 6 0.52 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (33%) 4 (67%)
14. The amount of work required is appropriate for the credit received.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.33 6 0.82 Freq(%) 0 (0%) 0 (0%) 1 (17%) 2 (33%) 3 (50%)
15. My overall evaluation of this instructor is....
very good
Great teacher. will take another course offered by him in the future if possible.
A+ Very good. Dr. Nelson maintained an interest in the course content over the entire semester. He also utilized class time in an efficient manner by using multiple instruction techniques during the class.
a very knowledgeable professor. He uses effective teaching strategies that make the course concepts easy to understand.
Very knowledgeable professor
16. Assignments are graded fairly.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.67 6 0.52 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (33%) 4 (67%)
17. Reading assignments require a reasonable amount of time and effort.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.5 6 0.55 Freq(%) 0 (0%) 0 (0%) 0 (0%) 3 (50%) 3 (50%)
18. Audiovisual materials (or computers) were adequate and used appropriately.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.67 6 0.52 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (33%) 4 (67%)
19. We encountered a good variety of clinical problems.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.83 6 0.41 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (17%) 5 (83%)
20. The amount of work expected outside class was appropriate.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.83 6 0.41 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (17%) 5 (83%)
21. The field trips were useful learning experiences.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.83 6 0.41 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (17%) 5 (83%)
22. Grades are assigned fairly and impartially.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.67 6 0.52 Freq(%) 0 (0%) 0 (0%) 0 (0%) 2 (33%) 4 (67%)
23. My overall evaluation of this course is...
Good course. Should be required for TPSS, PEPS, and NREM majors
This is very good course for those interested in plant disease management. It does very well at integrating several pest management strategies and tactics.
Very informative course, could be organized more systematically
24. Other comments:
Strongly advised for plant pathology graduate students to take this course.

Scot Nelson: PEPS660, Spring 2012     Back to top

Campus: University of Hawaii at Manoa Department: Plant & Environmtl Protect Sci
Course: PEPS 660 - Seminar in Plant Pathology Crn (Section): 83593 (001)    
1. The instructor demonstrated knowledge of course content.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 5 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 5 (100%)
2. The instructor fulfilled the goals of the course.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
5.0 5 0.0 Freq(%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 5 (100%)
3. The instructor communicated effectively.
Mean N-Size Std Dev   Strongly Disagree   Disagree   Neutral   Agree   Strongly Agree  
4.8 5 0.45 Freq(%) 0 (0%) 0 (0%) 0 (0%) 1 (20%) 4 (80%)
4. Other comments:
Dr. Nelson was very helpful in improving our presentation skills.
He is a good teacher having very good knowledge of his field specially in extension.