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| | Binomial Creep - CFO.com |
 | | The model assumes that options are exercised at the end of the option's contractual term and that expected volatility, dividends, and Treasury interest rates remain constant. |
 | | Just when those options are actually exercised is affected by demographic factors such as age, gender, pay level, and years of service to the company as well as variables such as share-price movement, expected stock volatility, expected holding period, vesting period, and company-specific exercise rules. |
 | | Six large brokerages, which together handle 85 percent of employee stock option trades, have agreed to share their exercise data with the SoA; the group is also eliciting comment and advice from the Big Four accounting firms regarding assumptions and model technology. |
| www.cfo.com /printable/article.cfm/6940478?f=options (892 words) |
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