Brattle supported an oil and gas accounting expert in determining the contractually defined net profits earned in an oil concession in Africa. Brattle reviewed 10+ years of joint venture general ledger records, samples of supporting documentation, and audited financial reports. After evaluating the validity and reliability of the general ledgers based on supporting documentation, we worked with the accounting expert to calculate the cash-basis profits earned by the concession. Brattle also supported the testifying expert in rebutting certain flawed accounting methodologies employed by the opposing party’s expert.