Psychology (PSYC)
PSYC 1100 Intro to Psyc: Basic Processes (Cr: 3)
Langley
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10203 L10 Class 09/Jan - 16/Apr R 1300 1550 Langley, East 1540 Lopes, Evan
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10804 A75 Online class 09/Jan - 16/Apr - - Online Podrouzek, Wayne Orientation 12/Jan - 12/Jan R 0830 0950 Surrey, Cedar 2045 Podrouzek, Wayne Mid-term exam 22/Feb - 22/Feb W 1000 1250 Surrey, Fir 220 Podrouzek, Wayne Final exam 20/Apr - 20/Apr F 0800 1100 Surrey Main 2820 Podrouzek, Wayne
The orientation, midterm and final exam will be at the Surrey campus.
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10169 R10 Class 09/Jan - 16/Apr T R 0830 0950 Richmond Main 2520 Thompson, Susan
Section R10 room change effective Jan 10 at 10am .
10173 R12 Class 09/Jan - 16/Apr M W 1130 1250 Richmond Main 1830 Murray, Sarah
10174 R13 Class 09/Jan - 16/Apr M W 1300 1420 Richmond Main 1830 Murray, Sarah
10969 R14 Class 09/Jan - 16/Apr M W 1000 1120 Richmond Main 1830 Murray, Sarah
11740 R15 Class 09/Jan - 16/Apr R 1300 1550 Richmond Main 1840 Wehr, Paul Final exam 26/Apr - 26/Apr R 1130 1430 Richmond Main 1840 Wehr, Paul
10181 R50 Class 09/Jan - 16/Apr R 1900 2150 Richmond Main 2500 Phillips, Susana Final exam 19/Apr - 19/Apr R 1900 2200 Richmond Main 2500 Phillips, Susana
10162 R51 Class 09/Jan - 16/Apr M 1900 2150 Richmond Main 1840 Thompson, Susan
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10106 S10 Class 09/Jan - 16/Apr M 1600 1850 Surrey Main 2840 Spaulding, Betsy Final exam 23/Apr - 23/Apr M 1500 1800 Surrey Main 2840 Spaulding, Betsy
10108 S11 Class 09/Jan - 16/Apr T 1300 1550 Surrey Main 2820 Shah, Ashiq Final exam 24/Apr - 24/Apr T 1130 1430 Surrey Main 2820 Shah, Ashiq
10111 S13 Class 09/Jan - 16/Apr M W 1730 1850 Surrey Main 2810 Austin, KirkFinal exam 25/Apr - 25/Apr W 1500 1800 Surrey Main 2810 Austin, Kirk
Section S13 final exam cancelled Dec 13 .
10112 S14 Class 09/Jan - 16/Apr F 1000 1250 Surrey Main 2840 Vittoz, Nicole Final exam 20/Apr - 20/Apr F 0800 1100 Surrey Main 2840 Vittoz, Nicole
10113 S16 Class 09/Jan - 16/Apr R 1600 1850 Surrey Main 2810 Thinda, SundeepFinal exam 26/Apr - 26/Apr R 1500 1800 Surrey Main 2810 Thinda, Sundeep
Section S16 Final exam cancelled Feb 2.
10853 S17 Class 09/Jan - 16/Apr M W 0830 0950 Surrey Main 2810 Le Grand, RichardFinal exam 18/Apr - 18/Apr W 0800 1100 Surrey Main 2810 Le Grand, Richard
Section S17 Final exam cancelled Jan 31.
10968 S19 Class 09/Jan - 16/Apr T R 0830 0950 Surrey Main 2840 Jones, Christopher Final exam 26/Apr - 26/Apr R 0800 1100 Surrey Main 2840 Jones, Christopher
11641 S20 Class 09/Jan - 16/Apr T R 1000 1120 Surrey Main 2840 Jones, Christopher Final exam 19/Apr - 19/Apr R 0800 1100 Surrey Main 2840 Jones, Christopher
10107 S50 Class 09/Jan - 16/Apr R 1900 2150 Surrey Main 2840 Lopes, Evan
11911 S51 Class 09/Jan - 16/Apr M 1900 2150 Surrey Main 2840 Spaulding, Betsy Final exam 23/Apr - 23/Apr M 1900 2200 Surrey Main 2840 Spaulding, Betsy
10970 S52 Class 09/Jan - 16/Apr W 1900 2150 Surrey Main 2840 Parhar, Karen Final exam 18/Apr - 18/Apr W 1900 2200 Surrey Main 2840 Parhar, Karen
10110 S53 Class 09/Jan - 16/Apr T 1900 2150 Surrey, Fir 218 Vittoz, Nicole Final exam 24/Apr - 24/Apr T 1900 2200 Surrey, Fir 218 Vittoz, Nicole
PSYC 1200 Intro.to Psyc: Areas & Applic (Cr: 3)
Langley
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10204 L10 Class 09/Jan - 16/Apr T 1600 1850 Langley, West 2045 McDonald, Robert Final exam 24/Apr - 24/Apr T 1500 1800 Langley, West 2045 McDonald, Robert
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10281 A75 Online class 09/Jan - 16/Apr - - Online Froc, David Orientation 10/Jan - 10/Jan T 0900 0950 Surrey, Cedar 2045 Froc, David
The orientation will be held at the Surrey campus.
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10182 R10 Class 09/Jan - 16/Apr T 1600 1850 Richmond Main 1830 Phillips, Susana Final exam 24/Apr - 24/Apr T 1500 1800 Richmond Main 1830 Phillips, Susana
10184 R11 Class 09/Jan - 16/Apr M 1300 1550 Richmond Main 2150 Rideout, Betty
10971 R12 Class 09/Jan - 16/Apr T R 1000 1120 Richmond Main 1830 Marasigan, John Final exam 19/Apr - 19/Apr R 0800 1100 Richmond Main 1830 Marasigan, John
11198 R13 Class 09/Jan - 16/Apr T 1300 1550 Richmond Main 1830 Marasigan, John Final exam 24/Apr - 24/Apr T 1130 1430 Richmond Main 1830 Marasigan, John
10185 R14 Class 09/Jan - 16/Apr F 1000 1250 Richmond Main 3080 Thompson, Susan Final exam 20/Apr - 20/Apr F 0800 1100 Richmond Main 3080 Thompson, Susan
12040 R50 Class 09/Jan - 16/Apr M 1900 2150 Richmond Main 1830 Phillips, Susana Final exam 23/Apr - 23/Apr M 1900 2200 Richmond Main 1830 Phillips, Susana
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10115 S10 Class 09/Jan - 16/Apr R 1300 1550 Surrey Main 2810 Shah, Ashiq Final exam 26/Apr - 26/Apr R 1130 1430 Surrey Main 2810 Shah, Ashiq
10116 S11 Class 09/Jan - 16/Apr M 1000 1250 Surrey Main 2840 Pedersen, Cory Final exam 23/Apr - 23/Apr M 0800 1100 Surrey Main 2840 Pedersen, Cory
11030 S12 Class 09/Jan - 16/Apr T 1000 1250 Surrey Main 2820 Pedersen, Cory Final exam 24/Apr - 24/Apr T 0800 1100 Surrey Main 2820 Pedersen, Cory
10117 S13 Class 09/Jan - 16/Apr M W 1130 1250 Surrey Main 2810 Reichl, Arleigh Final exam 18/Apr - 18/Apr W 1130 1430 Surrey Main 2810 Reichl, Arleigh
11200 S14 Class 09/Jan - 16/Apr M W 1600 1720 Surrey Main 2810 Reichl, Arleigh Final exam 23/Apr - 23/Apr M 1500 1800 Surrey Main 2810 Reichl, Arleigh
11201 S15 Class 09/Jan - 16/Apr T 1600 1850 Surrey Main 2820 Froc, David
11732 S16 Class 09/Jan - 16/Apr W 1600 1850 Surrey Main 2820 Rideout, Betty
11197 S17 Class 09/Jan - 16/Apr R 1000 1250 Surrey Main 2810 Leung, Debbie Final exam 19/Apr - 19/Apr R 0800 1100 Surrey Main 2810 Leung, Debbie
11199 S50 Class 09/Jan - 16/Apr T 1900 2150 Surrey Main 2840 Shah, Ashiq Final exam 24/Apr - 24/Apr T 1900 2200 Surrey Main 2840 Shah, Ashiq
PSYC 2300 Applied Statistics (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10186 R10 Class 09/Jan - 16/Apr T R 1130 1250 Richmond Main 1830 Murray, Sarah
10972 R11 Class 09/Jan - 16/Apr M W 1430 1550 Richmond Main 1830 Marasigan, John Final exam 25/Apr - 25/Apr W 1130 1430 Richmond Main 1830 Marasigan, John
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10119 S10 Class 09/Jan - 16/Apr T 1000 1250 Surrey, Fir 116 McDonald, Robert Final exam 24/Apr - 24/Apr T 0800 1100 Surrey, Fir 116 McDonald, Robert
10121 S11 Class 09/Jan - 16/Apr M 1300 1550 Surrey Main 2810 Froc, David
PSYC 2315 Brain and Behaviour (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Langley
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11208 L10 Class 09/Jan - 16/Apr M 1600 1850 Langley, West 2120 McDonald, Robert Final exam 23/Apr - 23/Apr M 1500 1800 Langley, West 2120 McDonald, Robert
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10973 R10 Class 09/Jan - 16/Apr R 1600 1850 Richmond Main 1840 Vittoz, Nicole Final exam 26/Apr - 26/Apr R 1500 1800 Richmond Main 1840 Vittoz, Nicole
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10123 S10 Class 09/Jan - 16/Apr M 1000 1250 Surrey, Fir 220 McDonald, Robert Mid-term exam 13/Feb - 13/Feb M 1000 1250 Surrey, Fir 128 McDonald, Robert Mid-term exam 19/Mar - 19/Mar M 1000 1250 Surrey, Fir 128 McDonald, Robert Final exam 23/Apr - 23/Apr M 0800 1100 Surrey, Fir 2422 McDonald, Robert
Section S10 final exam room change Jan 10; Mid-term exams added Jan 16
PSYC 2320 Developmental Psyc: Childhood (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10124 S10 Class 09/Jan - 16/Apr M 1000 1250 Surrey Main 2820 Thompson, Susan
PSYC 2321 Develop. Psych: Adolescence (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11209 S10 Class 09/Jan - 16/Apr W 1000 1250 Surrey Main 2840 Eisen, LisaFinal exam 18/Apr - 18/Apr W 1130 1430 Surrey Main 2840 Eisen, Lisa
Section S10 final exam cancelled Mar 12.
PSYC 2322 Developmental Psyc: Adulthood (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11211 R50 Class 09/Jan - 16/Apr T 1900 2150 Richmond Main 2500 Thompson, Susan
PSYC 2330 Social Psychology (Cr: 3)
Prerequisites: PSYC 1100 and 1200
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11926 A75 Online class 09/Jan - 16/Apr - - Online Rideout, Betty Orientation 13/Jan - 13/Jan F 1200 1320 Surrey Main 3820 Rideout, Betty Mid-term exam 21/Feb - 21/Feb T 1900 2150 Surrey, Fir 220 Rideout, Betty Final exam 20/Apr - 20/Apr F 1130 1430 Surrey Main 2840 Rideout, Betty
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10199 R10 Class 09/Jan - 16/Apr M 1600 1850 Richmond Main 1830 Klymchuk, Kai-lee Final exam 23/Apr - 23/Apr M 1500 1800 Richmond Main 1830 Klymchuk, Kai-lee
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10127 S10 Class 09/Jan - 16/Apr M 1600 1850 Surrey Main 2820 Shah, Ashiq Final exam 23/Apr - 23/Apr M 1500 1800 Surrey Main 2820 Shah, Ashiq
PSYC 2350 Psychopathology (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Langley
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10128 L10 Class 09/Jan - 16/Apr W 1300 1550 Langley, West 2120 Lopes, Evan
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10200 R10 Class 09/Jan - 16/Apr T 1600 1850 Richmond Main 3650 Jones, Christopher Final exam 24/Apr - 24/Apr T 1500 1800 Richmond Main 3650 Jones, Christopher
PSYC 2370 Psychology of Personality (Cr: 3)
Prerequisite: PSYC 1100 and 1200
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10129 S10 Class 09/Jan - 16/Apr R 1300 1550 Surrey Main 2840 Jones, Christopher Final exam 26/Apr - 26/Apr R 1130 1430 Surrey Main 2840 Jones, Christopher
PSYC 2375 Perception (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10201 S50 Class 09/Jan - 16/Apr M 1900 2150 Surrey Main 2820 Bernstein, Daniel Final exam 23/Apr - 23/Apr M 1900 2200 Surrey Main 2820 Bernstein, Daniel
PSYC 2385 Cognition (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10206 R10 Class 09/Jan - 16/Apr T 1300 1550 Richmond Main 1840 Bernstein, Daniel Final exam 24/Apr - 24/Apr T 1130 1430 Richmond Main 1840 Bernstein, Daniel
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11210 S10 Class 09/Jan - 16/Apr M 1300 1550 Surrey Main 2840 Bernstein, Daniel Final exam 23/Apr - 23/Apr M 1130 1430 Surrey Main 2840 Bernstein, Daniel
PSYC 2400 Exper. Psyc:Research Method. (Cr: 3)
Prerequisites: PSYC 1100 and 1200
Langley
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10130 L10 Class 09/Jan - 16/Apr W 1600 1850 Langley, West 2120 Lopes, Evan
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10974 R10 Class 09/Jan - 16/Apr F 1000 1250 Richmond Main 1840 Leung, Debbie Final exam 20/Apr - 20/Apr F 0800 1100 Richmond Main 1840 Leung, Debbie
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10918 S10 Class 09/Jan - 16/Apr R 1600 1850 Surrey Main 2820 Bhatt, Gira
Section S10 cancelled and converted to a later time block; see new addition, section S50 CRN 12209
12209 S50 Class 09/Jan - 16/Apr R 1900 2150 Surrey, Cedar 1040 Bhatt, Gira
New section S50 added Dec 6; seats open Dec 7 at 9:00am
The following 3000 and 4000 level PSYC courses are restricted to students with third-year standing in the BA PSYC Honours, Major, PSYC Minor (within a double minor program, or as a minor added to any major program), BSc PSYC Honours and Majors, and to all BAA PSYC students.
Program restrictions will be removed as of Thursday, November 10 at 08:45am.
PSYC 3010 Human Sexuality (Cr: 3)
Prerequisites: PSYC 2300 and 2400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11912 S10 Class 09/Jan - 16/Apr M 1300 1550 Surrey Main 2820 Pedersen, Cory Final exam 23/Apr - 23/Apr M 1130 1430 Surrey Main 2820 Pedersen, Cory
PSYC 3210 Attitudes and Persuasion (Cr: 3)
Prerequisites: PSYC 2300 and 2330 and 2400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11212 S10 Class 09/Jan - 16/Apr R 1000 1250 Surrey Main 2820 Reichl, Arleigh
PSYC 3307 Hist. & Phil. Found. of Psyc (Cr: 3)
Prerequisites: (PSYC 1100 and 1200 and 18 credits of 1100 or higher) or (60 credits of 1100-level or higher)
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11213 S50 Class 09/Jan - 16/Apr R 1600 1850 Surrey Main 2840 Rideout, Betty Final exam 26/Apr - 26/Apr R 1500 1800 Surrey Main 2840 Rideout, Betty
PSYC 3343 Psychology of Prejudice (Cr: 3)
Prerequisites: PSYC 2300 and 2330 and (PSYC 2400 or equivalent)
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11214 S10 Class 09/Jan - 16/Apr W 1600 1850 Surrey Main 2840 Bhatt, Gira
PSYC 3350 Advanced Topics in Psychopathology (Cr: 3)
Prerequisites: PYSC 2300 and 2350 and 2400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11216 S10 Class 09/Jan - 16/Apr T 1300 1550 Surrey Main 2840 Spaulding, BetsyFinal exam 24/Apr - 24/Apr T 1130 1430 Surrey Main 2840 Spaulding, Betsy
Section S10 final exam cancelled Feb 1
PSYC 3500 Interpersonal Relations I (Cr: 3)
Prerequisites: PSYC 2330 and 2400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11218 S10 Class 09/Jan - 16/Apr F 1000 1250 Surrey Main 2820 Parhar, Karen
PSYC 3600 Health Psychology (Cr: 3)
Prerequisites: PSYC 2300 and 2330 and 2400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
10146 S10 Class 09/Jan - 16/Apr W 1300 1550 Surrey Main 2840 Phillips, Susana Final exam 25/Apr - 25/Apr W 1130 1430 Surrey Main 2840 Phillips, Susana
PSYC 3910 Neuropsychology (Cr: 3)
Prerequisites: PSYC 2300 and 2315 and 2400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11913 S10 Class 09/Jan - 16/Apr M 1600 1850 Surrey Main 2801 Vittoz, Nicole Final exam 23/Apr - 23/Apr M 1500 1800 Surrey Main 2801 Vittoz, Nicole
PSYC 3960 Program Evaluation (Cr: 3)
Prerequisites: PSYC 2300 and 2400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11219 S10 Class 09/Jan - 16/Apr R 1300 1550 Surrey Main 2820 Tweed, Roger
PSYC 3980 Environmental Psychology (Cr: 3)
Prerequisites: PSYC 2300 and 2330 and (PSYC 2400 or CRIM 1208 or SOCI 2260)
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11924 R10 Class 09/Jan - 16/Apr R 1600 1850 Richmond Main 1830 van de Wetering, Sven Final exam 26/Apr - 26/Apr R 1500 1800 Richmond Main 1830 van de Wetering, Sven
PSYC 4100 Tests and Measurement (Cr: 3)
Prerequisites: PSYC 3300
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11220 S10 Class 09/Jan - 16/Apr M W 1000 1120 Surrey Main 2810 Marasigan, John
Final exam 23/Apr - 23/Apr M 1130 1430 Surrey Main 2810 Marasigan, John
Final exam day and time changed Jan.27.
PSYC 4315 Neuroscience (Cr: 3)
Prerequisites: PSYC 2300 and 2315 and 2400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11222 S10 Class 09/Jan - 16/Apr T 1000 1250 Surrey Main 2810 Froc, David
PSYC 4350 Development Psychopathology (Cr: 3)
Prerequisites: PSYC 2300 and 2350 and 2400 and (2320 or 2321)
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11223 S10 Class 09/Jan - 16/Apr T 1600 1850 Surrey Main 2840 Pedersen, Cory Final exam 24/Apr - 24/Apr T 1500 1800 Surrey Main 2840 Pedersen, Cory
PSYC 4400 Research Methods II:Qualitativ (Cr: 3)
Prerequisites: PSYC 3300 and 3400
Surrey
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11224 S10 Class 09/Jan - 16/Apr M W 0830 0950 Surrey Main 2840 Podrouzek, Wayne Final exam 18/Apr - 18/Apr W 0800 1100 Surrey Main 2840 Podrouzek, Wayne
PSYC 4600 Positive Psychology (Cr: 3)
Prerequisites: PYSC 2300 and (PSYC 2400 or CRIM 1208 or SOCI 2260)
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11925 R10 Class 09/Jan - 16/Apr F 1000 1250 Richmond Main 1830 Tweed, Roger
PSYC 4700 Culture and Psychology (Cr: 3)
Prerequisites: PSYC 2300 and 2330 and (PSYC 2400 or CRIM 2103 or SOCI 2260 or MATH 2335)
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11225 R10 Class 09/Jan - 16/Apr R 1300 1550 Richmond Main 1820 Parhar, Karen
PSYC 4910 Rehabilitation (Cr: 3)
Corequisites:PSYC 2300 and 2330 and 2400
Richmond
CRN SECTION TYPE DATES DAYS START END BUILDING ROOM INSTRUCTOR
11226 R10 Class 09/Jan - 16/Apr W 1600 1850 Richmond Main 1820 Spaulding, Betsy
Section R10 room change Jan 20