diff --git a/source/engine/index.js b/source/engine/index.js
index 3529e1d9c..9d4e61c76 100644
--- a/source/engine/index.js
+++ b/source/engine/index.js
@@ -19,7 +19,7 @@ let enrichRules = input =>
 	(typeof input === 'string' ? yaml.safeLoad(input) : input).map(enrichRule)
 
 export default {
-	evaluate: (targetNames, nestedSituation, rulesConfig) => {
+	evaluate: (targetInput, nestedSituation, rulesConfig) => {
 		let rules = rulesConfig
 			? do {
 					let { base, extra } = rulesConfig
@@ -30,8 +30,12 @@ export default {
 			  }
 			: rulesFr
 
-		return analyseMany(parseAll(rules), targetNames)(
-			nestedSituationToStateSelector(rules)(nestedSituation)
-		)
+		let evaluation = analyseMany(
+			parseAll(rules),
+			Array.isArray(targetInput) ? targetInput : [targetInput]
+		)(nestedSituationToStateSelector(rules)(nestedSituation))
+
+		let values = evaluation.targets.map(t => t.nodeValue)
+		return Array.isArray(targetInput) ? values : values[0]
 	}
 }
diff --git a/source/règles/sasu.yaml b/source/règles/sasu.yaml
index 6f2ad748e..976a6cd49 100644
--- a/source/règles/sasu.yaml
+++ b/source/règles/sasu.yaml
@@ -55,10 +55,11 @@
 - nom: salaire total
   formule: chiffre affaires * répartition salaire sur dividendes 
 
-  #-> on en deduit le net car le total a une valeur 
+- nom: net après impôt
+  format: euros
 
 - nom: revenu disponible
-  formule: contrat salarié . salaire . net après impôt + dividendes . net
+  formule: net après impôt + dividendes . net
 
 
 
diff --git a/test/library.test.js b/test/library.test.js
index 6965a4284..b3f821120 100644
--- a/test/library.test.js
+++ b/test/library.test.js
@@ -6,26 +6,26 @@ import sasuRules from '../source/règles/sasu.yaml'
 describe('library', function() {
 	it('should evaluate one target with no input data', function() {
 		let target = 'contrat salarié . salaire . net'
-		let evaluated = Syso.evaluate([target], {
+		let value = Syso.evaluate(target, {
 			'contrat salarié': { salaire: { 'brut de base': 2300 } }
 		})
-		let evaluatedTarget = evaluated.targets.find(propEq('dottedName', target))
-		expect(evaluatedTarget)
-			.to.have.property('nodeValue')
-			.to.be.within(1779, 1780)
+		expect(value).to.be.within(1779, 1780)
 	})
 
 	it('should let the user replace the default rules', function() {
 		let rules = `
 - nom: yo
-  formule: 90890
+  formule: 200
 - nom: ya
   formule:  yo + 1
+- nom: yi
+  formule:  yo + 2
 `
 
-		let evaluated = Syso.evaluate(['ya'], {}, { base: rules })
+		let values = Syso.evaluate(['ya', 'yi'], {}, { base: rules })
 
-		expect(evaluated.targets[0].nodeValue).to.equal(90891)
+		expect(values[0]).to.equal(201)
+		expect(values[1]).to.equal(202)
 	})
 	it('should let the user add rules to the default ones', function() {
 		let rules = `
@@ -35,25 +35,43 @@ describe('library', function() {
   formule:  contrat salarié . salaire . net + yo
 `
 
-		let evaluated = Syso.evaluate(
-			['ya'],
+		let value = Syso.evaluate(
+			'ya',
 			{
 				'contrat salarié . salaire . brut de base': 2300
 			},
 			{ extra: rules }
 		)
 
-		expect(evaluated.targets[0].nodeValue).to.be.closeTo(1780.41, 1)
+		expect(value).to.be.closeTo(1780.41, 1)
 	})
 	it('should let the user extend the rules constellation in a serious manner', function() {
-		let evaluated = Syso.evaluate(
-			['dividendes . net'],
+		let salaireTotal = Syso.evaluate(
+			'salaire total',
 			{
 				'chiffre affaires': 5000
 			},
 			{ extra: sasuRules }
 		)
 
-		expect(evaluated.targets[0].nodeValue).to.be.closeTo(1500, 1)
+		console.log(salaireTotal)
+		let salaireNetAprèsImpôt = Syso.evaluate(
+			'contrat salarié . salaire . net après impôt',
+			{
+				'contrat salarié': { rémunération: { total: salaireTotal } }
+			}
+		)
+
+		console.log(salaireNetAprèsImpôt)
+
+		let revenuDisponible = Syso.evaluate(
+			'revenu disponible',
+			{
+				'net après impôt': salaireNetAprèsImpôt,
+				'chiffre affaires': 5000
+			},
+			{ extra: sasuRules }
+		)
+		console.log(revenuDisponible)
 	})
 })