text: **Choice of valuation model.**Under SFAS 123, stock options were generally valued 
  using the Black-Scholes model. SFAS 123(R) does not specify which model must be 
  used, but requires that certain assumptions be included in the chosen model. 
  Essentially, we have a choice of continuing to apply the Black-Scholes model or 
  applying a binomial (lattice) model. The key difference is that a binomial model can 
  better account for sub-optimal exercises; that is, exercises before the contractual 
  expiration of the option. A binominal model is more complex to apply, and generally 
  results in a lower value than a comparable valuation using the Black-Scholes model. 
  We have not yet determined which model we will apply. 