diff --git a/build/build.go b/build/build.go
index f2bc5f7..598ab52 100644
--- a/build/build.go
+++ b/build/build.go
@@ -60,15 +60,30 @@ type semantics struct {
 	delicious    float64
 }
 
+func (s semantics) combine(other semantics, weight float64) semantics {
+	return semantics{
+		s.accomodating + other.accomodating*weight,
+		s.affordable + other.affordable*weight,
+		s.atmospheric + other.atmospheric*weight,
+		s.delicious + other.delicious*weight}
+}
+
+func (s semantics) reduce(weight float64) semantics {
+	return semantics{
+		s.accomodating / weight,
+		s.affordable / weight,
+		s.atmospheric / weight,
+		s.delicious / weight}
+}
+
 type restaurant struct {
-	name string
+	name    string
+	reviews []review
+	sem     semantics
 
 	latitude  float64
 	longitude float64
 
-	sem     semantics
-	reviews []review
-
 	closestStnName string
 	closestStnDist float64
 }
@@ -165,6 +180,30 @@ func computeSemantics(restaraunts map[uint64]*restaurant) {
 	type definer interface {
 		define(keyword string) semantics
 	}
+
+	for _, rest := range restaraunts {
+		var (
+			sem    semantics
+			weight float64
+		)
+
+		for _, rev := range rest.reviews {
+			def, ok := rev.scr.(definer)
+			if !ok {
+				continue
+			}
+
+			for name, value := range rev.features {
+				sem = sem.combine(def.define(name), rev.weight*value)
+			}
+
+			weight += rev.weight
+		}
+
+		if weight > 0.0 {
+			rest.sem = sem.reduce(weight)
+		}
+	}
 }
 
 func dumpData(dbPath string, restaraunts map[uint64]*restaurant) error {
diff --git a/build/scrape.go b/build/scrape.go
index 3f9bb21..ee9fa85 100644
--- a/build/scrape.go
+++ b/build/scrape.go
@@ -31,17 +31,12 @@ import (
 	"github.com/fatih/color"
 )
 
-type feature struct {
-	value  float64
-	weight float64
-}
-
 type review struct {
-	name    string
-	address string
-	url     string
-
-	features map[string]feature
+	name     string
+	address  string
+	url      string
+	features map[string]float64
+	weight   float64
 
 	latitude  float64
 	longitude float64
@@ -52,7 +47,7 @@ type review struct {
 
 type scraper interface {
 	index(doc *goquery.Document) (string, []string)
-	review(doc *goquery.Document) (string, string, map[string]feature, error)
+	review(doc *goquery.Document) (string, string, map[string]float64, float64, error)
 	decode(address string) (float64, float64, error)
 	load(url string) (*goquery.Document, error)
 }
@@ -92,7 +87,7 @@ func scrapeReview(url string, out chan review, scr scraper, group *sync.WaitGrou
 	)
 
 	if doc, rev.err = scr.load(rev.url); rev.err == nil {
-		rev.name, rev.address, rev.features, rev.err = scr.review(doc)
+		rev.name, rev.address, rev.features, rev.weight, rev.err = scr.review(doc)
 	}
 
 	out <- rev
diff --git a/build/tabelog.go b/build/tabelog.go
index da9ec0a..928589c 100644
--- a/build/tabelog.go
+++ b/build/tabelog.go
@@ -61,7 +61,8 @@ func (tabelog) index(doc *goquery.Document) (string, []string) {
 	return nextIndexUrl, reviewUrls
 }
 
-func (tabelog) review(doc *goquery.Document) (name, address string, features map[string]feature, err error) {
+func (tabelog) review(doc *goquery.Document) (name, address string, features map[string]float64, weight float64, err error) {
+	weight = 1.0
 	name = doc.Find("a.rd-header__rst-name-main").Text()
 
 	if addresses := doc.Find("p.rd-detail-info__rst-address"); addresses.Length() == 2 {
@@ -71,7 +72,7 @@ func (tabelog) review(doc *goquery.Document) (name, address string, features map
 		return
 	}
 
-	features = make(map[string]feature)
+	features = make(map[string]float64)
 
 	for index, category := range []string{"dishes", "service", "atmosphere", "cost", "drinks"} {
 		valueText := doc.Find(fmt.Sprintf("#js-rating-detail > dd:nth-child(%d)", (index+1)*2)).Text()
@@ -82,7 +83,7 @@ func (tabelog) review(doc *goquery.Document) (name, address string, features map
 			return
 		}
 
-		features[category] = feature{value/2.5 - 1.0, 1.0}
+		features[category] = value/2.5 - 1.0
 	}
 
 	return
diff --git a/build/tripadvisor.go b/build/tripadvisor.go
index 21d6b57..6f413c6 100644
--- a/build/tripadvisor.go
+++ b/build/tripadvisor.go
@@ -60,7 +60,8 @@ func (tripadvisor) index(doc *goquery.Document) (string, []string) {
 	return nextIndexUrl, reviewUrls
 }
 
-func (tripadvisor) review(doc *goquery.Document) (name, address string, features map[string]feature, err error) {
+func (tripadvisor) review(doc *goquery.Document) (name, address string, features map[string]float64, weight float64, err error) {
+	weight = 1.0
 	name = strings.TrimSpace(doc.Find("h1#HEADING").Text())
 	address = strings.TrimSpace(doc.Find("address span.format_address").Text())
 
@@ -70,7 +71,7 @@ func (tripadvisor) review(doc *goquery.Document) (name, address string, features
 		return
 	}
 
-	features = make(map[string]feature)
+	features = make(map[string]float64)
 
 	for index, category := range []string{"food", "service", "value", "atmosphere"} {
 		altText, _ := ratings.Eq(index).Attr("alt")
@@ -82,7 +83,7 @@ func (tripadvisor) review(doc *goquery.Document) (name, address string, features
 			return
 		}
 
-		features[category] = feature{value/2.5 - 1.0, 1.0}
+		features[category] = value/2.5 - 1.0
 	}
 
 	return