diff --git a/gpbft/gpbft.go b/gpbft/gpbft.go
index 3cd67e8b..5bf4d814 100644
--- a/gpbft/gpbft.go
+++ b/gpbft/gpbft.go
@@ -509,7 +509,7 @@ func (i *instance) beginQuality() error {
 	// Broadcast input value and wait to receive from others.
 	i.current.Phase = QUALITY_PHASE
 	i.participant.progression.NotifyProgress(i.current)
-	i.phaseTimeout = i.alarmAfterSynchronyWithMulti(i.participant.qualityDurationMulti)
+	i.phaseTimeout = i.alarmAfterSynchronyWithMulti(i.participant.qualityDeltaMulti)
 	i.resetRebroadcastParams()
 	i.broadcast(i.current.Round, QUALITY_PHASE, i.proposal, false, nil)
 	metrics.phaseCounter.Add(context.TODO(), 1, metric.WithAttributes(attrQualityPhase))
diff --git a/gpbft/options.go b/gpbft/options.go
index 4d808c10..fee9c308 100644
--- a/gpbft/options.go
+++ b/gpbft/options.go
@@ -23,7 +23,7 @@ type options struct {
 	delta                time.Duration
 	deltaBackOffExponent float64
 
-	qualityDurationMulti float64
+	qualityDeltaMulti float64
 
 	committeeLookback  uint64
 	maxLookaheadRounds uint64
@@ -40,7 +40,7 @@ func newOptions(o ...Option) (*options, error) {
 	opts := &options{
 		delta:                        defaultDelta,
 		deltaBackOffExponent:         defaultDeltaBackOffExponent,
-		qualityDurationMulti:         1.0,
+		qualityDeltaMulti:            1.0,
 		committeeLookback:            defaultCommitteeLookback,
 		rebroadcastAfter:             defaultRebroadcastAfter,
 		maxCachedInstances:           defaultMaxCachedInstances,
@@ -85,12 +85,12 @@ func WithDeltaBackOffExponent(e float64) Option {
 	}
 }
 
-func WithQualityDurationMultiplier(m float64) Option {
+func WithQualityDeltaMultiplier(m float64) Option {
 	return func(o *options) error {
 		if m < 0 {
 			return errors.New("quality duration multiplier cannot be less than zero")
 		}
-		o.qualityDurationMulti = m
+		o.qualityDeltaMulti = m
 		return nil
 	}
 }
diff --git a/manifest/manifest.go b/manifest/manifest.go
index 40c489a8..3dd08161 100644
--- a/manifest/manifest.go
+++ b/manifest/manifest.go
@@ -37,7 +37,7 @@ var (
 	DefaultGpbftConfig = GpbftConfig{
 		Delta:                      6 * time.Second,
 		DeltaBackOffExponent:       2.0,
-		QualityDurationMultiplier:  1.0,
+		QualityDeltaMultiplier:     1.0,
 		MaxLookaheadRounds:         5,
 		ChainProposedLength:        gpbft.ChainDefaultLen,
 		RebroadcastBackoffBase:     6 * time.Second,
@@ -99,10 +99,10 @@ func (c *CxConfig) Validate() error {
 }
 
 type GpbftConfig struct {
-	Delta                     time.Duration
-	DeltaBackOffExponent      float64
-	QualityDurationMultiplier float64
-	MaxLookaheadRounds        uint64
+	Delta                  time.Duration
+	DeltaBackOffExponent   float64
+	QualityDeltaMultiplier float64
+	MaxLookaheadRounds     uint64
 
 	ChainProposedLength int
 
@@ -120,8 +120,8 @@ func (g *GpbftConfig) Validate() error {
 		return fmt.Errorf("gpbft backoff exponent must be at least 1.0, was %f", g.DeltaBackOffExponent)
 	}
 
-	if g.QualityDurationMultiplier < 0 {
-		return fmt.Errorf("gpbft quality duration multiplier is negative: %f", g.QualityDurationMultiplier)
+	if g.QualityDeltaMultiplier < 0 {
+		return fmt.Errorf("gpbft quality duration multiplier is negative: %f", g.QualityDeltaMultiplier)
 	}
 
 	if g.ChainProposedLength < 1 {
@@ -148,7 +148,7 @@ func (g *GpbftConfig) ToOptions() []gpbft.Option {
 	return []gpbft.Option{
 		gpbft.WithDelta(g.Delta),
 		gpbft.WithDeltaBackOffExponent(g.DeltaBackOffExponent),
-		gpbft.WithQualityDurationMultiplier(g.QualityDurationMultiplier),
+		gpbft.WithQualityDeltaMultiplier(g.QualityDeltaMultiplier),
 		gpbft.WithMaxLookaheadRounds(g.MaxLookaheadRounds),
 		gpbft.WithRebroadcastBackoff(
 			DefaultGpbftConfig.RebroadcastBackoffExponent,
diff --git a/manifest/manifest_test.go b/manifest/manifest_test.go
index dc2c8e7f..dbf9a373 100644
--- a/manifest/manifest_test.go
+++ b/manifest/manifest_test.go
@@ -30,7 +30,7 @@ var base = manifest.Manifest{
 	Gpbft: manifest.GpbftConfig{
 		Delta:                      10,
 		DeltaBackOffExponent:       1.2,
-		QualityDurationMultiplier:  1.0,
+		QualityDeltaMultiplier:     1.0,
 		MaxLookaheadRounds:         5,
 		ChainProposedLength:        gpbft.ChainDefaultLen,
 		RebroadcastBackoffBase:     10,