Root flipping problem

A comprehensive flip card root cause analysis guide is also available from NCPS (see Web site as listed above). This card set walks the pharmacist through every step of a comprehensive root cause evaluation of a quality problem. For example, the cards begin with triage questions such as... 

Neither of these methods solved the problem. The first possibility would cause the conditional statement to infinitely flip back and forth between the different equations as it tried to find a solution. The Underwood, Chen and Paterson approximations had too many potential roots or solutions for a solver. One potential way of avoiding the computational problems is to model the cooling without the logarithmic-mean-temperature difference as is done in Akman et al. (2002). 

---