The developing countries have higher mortality rates for breast cancer. A reason for this is presentation atadvanced stages due to low levels of public awareness. Activities are arranged by health authorities of developingcountries to increase the knowledge of women but their effectiveness has not been evaluated in detail. A multiplechoice questionnaire with questions about socio-demographic profile and questions about breast cancer knowledgewas designed in local language Urdu, to evaluate the knowledge of the participants before and after an audiovisual educational activity in Lahore, Pakistan. Scores of 0-2, 3-5 and 6-8 were ranked as poor, fair and good,respectively. Among 146 participants these scores were achieved by 1%, 55% and 45% before activity and 0%,16% and 84% after the activity. Overall 66% of participants increased their knowledge score. Younger age,higher education, reliance on television as source of information and being a housewife were associated withbetter impact of the awareness activity. For the six knowledge related questions 3%, 5%, 11%, 23%, 33% and44% more participants gave correct answers after the activity. However 6% and 7% fewer participants answeredcorrectly for 2 questions related to the cause and the best prevention for breast cancer. The study indicatedthat awareness activities are effective to increase the knowledge of women and better impact is associated withhigher education and younger age of women. The component analysis showed that the questions and relatedpresentations using medical terms have a negative impact and should not therefore be used. Analysis of activitytherefore leads to identification of deficiencies which can be remedied in future.