Use of TBDs
Any SRS that uses the phrase “to be determined” (TBD) is not a complete SRS. The TBD is, however, occasionally necessary and should be accompanied by a) A description of the conditions causing the TBD (e.g., why an answer is not known) so that the situation can be resolved; b) A description of what must be done to eliminate the TBD, who is responsible for its elimination, and by when it must be eliminated.