<![CDATA[Vocational learning in Indonesian high schools remains largely theoretical, leaving students with little direct exposure to food packaging technology, food safety practice, modern plant propagation, and applied entrepreneurship. This community service program delivered an integrated vocational workshop for students of SMKN Pertanian Pembangunan Lembang, West Bandung, combining short presentations with hands-on sessions on four topics: active composite packaging film, qualitative testing of prohibited food additives, mushroom tissue culture, and entrepreneurship taught through design thinking. Change in self-reported understanding was measured with a pre-test and a post-test on a five-point scale, analyzed only for matched respondents. Mean composite scores rose from 2.37 to 3.53 for packaging film (n = 46), from 3.06 to 3.61 for food safety (n = 28), from 2.85 to 3.67 for tissue culture (n = 33), and from 3.75 to 4.03 for entrepreneurship (n = 83). All four gains were statistically significant (p < 0.001), but normalized gains ranged only from 0.22 to 0.44. The smallest gain (g) occurred in entrepreneurship, where most participants already ran small food businesses and rated themselves highly beforehand, while the largest occurred in the least familiar topic. Items that participants handled physically moved the furthest.]]>
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