The aim of this study is to analyze the shortcomings affecting the lack of use ‎of lesson plans by primary school teachers in Qazvin province. The research ‎was conducted using thematic analysis (Brown and Clark, 2006). In order to ‎collect data, semi-structured interviews were used with 20 teachers working ‎in elementary schools in Qazvin province. Data analysis was performed in ‎three steps during the coding process using MAXQDA software. In the first ‎step, the initial codes (basic themes) were extracted based on the evidence, ‎and in the next step, we categorized them to obtain organizing themes, and in ‎the final step, we grouped them around the main axis and extracted ‎overarching themes. The overarching themes in the present study showed ‎that the deficiencies affecting the lack of use of lesson plans by teachers are ‎embedded in three general axes: individual (psychological), organizational, ‎and educational. Motivational and participation challenges, lack of skills and ‎familiarity with new methods, lack of educational knowledge and ‎understanding, Environmental and structural limitations, content and ‎program pressure, lack of support and coordination of the educational ‎system, and cultural differences and developmental characteristics were ‎identified as deficiencies affecting the lack of use of lesson plans. Data ‎analysis shows that improving educational conditions, strengthening ‎managerial and financial support, and redesigning educational courses to suit ‎teachers' needs can pave the way for effective implementation of lesson ‎plans and improving the quality of teaching in primary schools.‎