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The study aim wasto designingand validationthe patternof self-learning packagefor multi-grade classesin secondprimary school&to investigateits internal validity.The method wasa mixed method withsequential exploratory design.In the qualitative part,the qualitativecontent analysis methodwas used,and in the quantitative part,the survey method was used for internal validity.In the qualitative part community wereall multigrade teachers,educational leaders,specialistsand experts and alldocuments and theoreticaland research resourcesof multigrade classes that15persons andrelated resources as samples were choosenusing targeted sampling method.Sample size was determined basedonthe principleof theoretical saturation.Data collection tools were reviewof theoreticaland research foundations and semi-structured interviews.In the quantitative part,for internal validity,the research population includedall multi-grade teachers and instructional design specialists,whom30peoples were selected by available sampling method that the commented about pattern in the first and final stagesof designing.The datacollection toolwas a researcher-made questionnaire.The findingsof the qualitative section showed8main components.Internal validity findings using one-samplet-test showed that the meanof all itemswas higherthan the hypothetical mean of3andthis differencewas significant.Accordingly,the self-learning package patternhas internal validity.