Visible Learning, 
                        Tomorrow’sTomorrow’s SchoolsSchools, 
                              TheThe MindsetsMindsets 
                      that make the difference
                              in Education
    John Hattie
    Visible Learning Laboratories
    University of Auckland
                                      InfluencesInfluences onon AchievementAchievement ??
                                                                                                                           00
                                                                DecreasedDecreased                                         ZeroZero                                         EnhancedEnhanced
               ReducingReducing ClassClass SizeSize onon Achievement?Achievement?
                               What is the effect of reducing class 
                               size
                               HundredsHundreds ofof evaluationsevaluations ofof reducingreducing 
                               class size ….
                                           00
                      DecreasedDecreased   ZeroZero         EnhancedEnhanced
                         EffEffectt on AAchihievementt over titime??
                                                                                 Reducing
                                                                                 Class Size
                                                                                00  .2020                         1.0
                                         Decreased                             Zero                            Enhanced
                            An effect‐size of                                                           .20            1.0
                            advancing achievement                                                    9 mths           3 yrs
                            %% imprimprovingoving rarattee ofof learninglearning                       10%10%          45%45%
                            r variable & achievement                                                    .10            .45
                            % of students with treatment exceeding those 
                            notnot trtreaeatteded                                                        88             3434