Direct Caltech to strengthen its monitoring procedures and internal control processes for applying indirect costs to Federal awards. Updated procedures could include: a. Requiring that personnel review rental expenses charged to NSF awards to assess whether the expenses included indirect costs. Specifically, Caltech should ensure the general ledger account codes it establishes to account for equipment rental charges do not apply indirect costs. b. Requiring that personnel review capitalized expenses charged to an NSF award to ensure that the capitalized amount includes all applicable costs.