(c) FHFA will temporarily adjust the percentages in the definitions of align, misalignment, and material misalignment, if FHFA determines that market conditions dictate that an adjustment is appropriate.

1. (1) In adjusting the percentages, FHFA will consider:

   1. (i) The prevailing level and volatility of interest rates;
   2. (ii) The level of credit risk embedded in the Enterprises' TBA-eligible MBS; and
   3. (iii) Such other factors as FHFA may, in consultation with the Enterprises, determine to be appropriate to promote market confidence in the alignment of cash flows to TBA-eligible MBS investors and to foster the efficiency and liquidity of the secondary mortgage market.
2. (2) FHFA will publicly announce any temporary adjustment to the percentages in the definition of align, misalignment, and material misalignment in a timely manner.
3. (3) If adjusted percentages remain in effect for six months or more, FHFA will amend this part's definitions by Federal Register Notice, with opportunity for public comment.

4. (4) Temporarily adjusted percentages will remain in effect until six months after the date on which FHFA announced the temporary adjustment unless within six months of that date—

   1. (i) FHFA announces a reversion to the previously prevailing percentages; or
   2. (ii) FHFA initiates the notice and comment process, in which case the temporary percentages will remain in effect until the conclusion of that process.

(d) FHFA will temporarily adjust the definitions of cohort, fastest paying quartile of a cohort, and specified pools, if FHFA determines that changes in market practices or conditions dictate that an adjustment is appropriate.

1. (1) In adjusting those definitions, FHFA will consider:

   1. (i) Changes in prevailing market practices related to the identification of specified pools;
   2. (ii) The prevailing interest rates environment;
   3. (iii) Observed relationships between pool characteristics and prepayment behavior of the Enterprises' TBA-eligible MBS; and
   4. (iv) Such other factors as FHFA may, in consultation with the Enterprises, determine to be appropriate to promote market confidence in the alignment of cash flows to TBA-eligible MBS investors and to foster the efficiency and liquidity of the secondary mortgage market.
2. (2) FHFA will publicly announce any temporary adjustment to the definitions of cohort and specified pools in a timely manner.
3. (3) If adjusted definitions remain in effect for six months or more, FHFA will amend this part's definitions by Federal Register Notice, with opportunity for public comment.

4. (4) Temporarily adjusted definitions will remain in place until six months after the date on which FHFA announced the temporary adjustment unless within six months of that date—

   1. (i) FHFA announces a reversion to the previously prevailing definitions; or
   2. (ii) FHFA initiates the notice and comment process, in which case the temporary definitions will remain in effect until the conclusion of that process.