Methods, systems, and computer program products are provided for determining a manufacturing capacity at a facility with assemblers performing assembly instructions in a computer directed assembly (CDA) system. Determining a manufacturing capacity includes selecting a production time interval for a product assembled using a sequence of assembly instructions. A scheduler system identifies assemblers available during the timeframe that have been trained and have performed the sequence of assembly instructions. Once this set of assemblers is identified, the scheduler projects an individual capacity for each assembler in the set of assemblers to perform the sequence of assembly instructions during the production time interval. The projected individual capacity is projected based on historical assembly performance data for each assembler stored in an assembly record database. The manufacturing capacity is then generated by aggregating the projected individual capacity for each assembler to perform the sequence of assembly instructions over the production time interval.