diff --git a/Source/SwiftLintFramework/Linter.swift b/Source/SwiftLintFramework/Linter.swift
index bfeee14ef..87dcd2d23 100644
--- a/Source/SwiftLintFramework/Linter.swift
+++ b/Source/SwiftLintFramework/Linter.swift
@@ -234,30 +234,82 @@ extension File {
             // swiftlint:enable_rule:force_cast
             var violations = self.astViolationsInDictionary(subDict)
             if let kindString = subDict["key.kind"] as? String,
-                let kind = flatMap(kindString, { SwiftDeclarationKind(rawValue: $0) })
-                where contains([.Class, .Struct, .Typealias, .Enum, .Enumelement], kind),
-                let name = subDict["key.name"] as? String,
-                let offset = flatMap(subDict["key.offset"] as? Int64, { Int($0) }) {
-                let location = Location(file: self, offset: offset)
-                let nameCharacterSet = NSCharacterSet(charactersInString: name)
-                if !NSCharacterSet.alphanumericCharacterSet().isSupersetOfSet(nameCharacterSet) {
-                    violations.append(StyleViolation(type: .NameFormat,
-                        location: location,
-                        reason: "Type name should only contain alphanumeric characters: '\(name)'"))
-                } else if !name.substringToIndex(name.startIndex.successor()).isUppercase() {
-                    violations.append(StyleViolation(type: .NameFormat,
-                        location: location,
-                        reason: "Type name should start with an uppercase character: '\(name)'"))
-                } else if count(name) < 3 || count(name) > 40 {
-                    violations.append(StyleViolation(type: .NameFormat,
-                        location: location,
-                        reason: "Type name should be between 3 and 40 characters in length: " +
-                        "'\(name)'"))
-                }
+                let kind = flatMap(kindString, { SwiftDeclarationKind(rawValue: $0) }) {
+                violations.extend(self.validateTypeName(kind, dict: subDict))
+                violations.extend(self.validateVariableName(kind, dict: subDict))
             }
             return violations
         }, [], +)
     }
+
+    func validateTypeName(kind: SwiftDeclarationKind, dict: XPCDictionary) -> [StyleViolation] {
+        let typeKinds: [SwiftDeclarationKind] = [
+            .Class,
+            .Struct,
+            .Typealias,
+            .Enum,
+            .Enumelement
+        ]
+        if !contains(typeKinds, kind) {
+            return []
+        }
+        var violations = [StyleViolation]()
+        if let name = dict["key.name"] as? String,
+            let offset = flatMap(dict["key.offset"] as? Int64, { Int($0) }) {
+            let location = Location(file: self, offset: offset)
+            let nameCharacterSet = NSCharacterSet(charactersInString: name)
+            if !NSCharacterSet.alphanumericCharacterSet().isSupersetOfSet(nameCharacterSet) {
+                violations.append(StyleViolation(type: .NameFormat,
+                    location: location,
+                    reason: "Type name should only contain alphanumeric characters: '\(name)'"))
+            } else if !name.substringToIndex(name.startIndex.successor()).isUppercase() {
+                violations.append(StyleViolation(type: .NameFormat,
+                    location: location,
+                    reason: "Type name should start with an uppercase character: '\(name)'"))
+            } else if count(name) < 3 || count(name) > 40 {
+                violations.append(StyleViolation(type: .NameFormat,
+                    location: location,
+                    reason: "Type name should be between 3 and 40 characters in length: " +
+                    "'\(name)'"))
+            }
+        }
+        return violations
+    }
+
+    func validateVariableName(kind: SwiftDeclarationKind, dict: XPCDictionary) -> [StyleViolation] {
+        let variableKinds: [SwiftDeclarationKind] = [
+            .VarClass,
+            .VarGlobal,
+            .VarInstance,
+            .VarLocal,
+            .VarParameter,
+            .VarStatic
+        ]
+        if !contains(variableKinds, kind) {
+            return []
+        }
+        var violations = [StyleViolation]()
+        if let name = dict["key.name"] as? String,
+            let offset = flatMap(dict["key.offset"] as? Int64, { Int($0) }) {
+            let location = Location(file: self, offset: offset)
+            let nameCharacterSet = NSCharacterSet(charactersInString: name)
+            if !NSCharacterSet.alphanumericCharacterSet().isSupersetOfSet(nameCharacterSet) {
+                violations.append(StyleViolation(type: .NameFormat,
+                    location: location,
+                    reason: "Variable name should only contain alphanumeric characters: '\(name)'"))
+            } else if name.substringToIndex(name.startIndex.successor()).isUppercase() {
+                violations.append(StyleViolation(type: .NameFormat,
+                    location: location,
+                    reason: "Variable name should start with a lowercase character: '\(name)'"))
+            } else if count(name) < 3 || count(name) > 40 {
+                violations.append(StyleViolation(type: .NameFormat,
+                    location: location,
+                    reason: "Variable name should be between 3 and 40 characters in length: " +
+                    "'\(name)'"))
+            }
+        }
+        return violations
+    }
 }
 
 extension String {
diff --git a/Source/SwiftLintFrameworkTests/LinterTests.swift b/Source/SwiftLintFrameworkTests/LinterTests.swift
index bdae37374..a269925e7 100644
--- a/Source/SwiftLintFrameworkTests/LinterTests.swift
+++ b/Source/SwiftLintFrameworkTests/LinterTests.swift
@@ -40,7 +40,6 @@ class LinterTests: XCTestCase {
             XCTAssertEqual(violations("\(kind) Ab {}\n"), [StyleViolation(type: .NameFormat,
                 location: Location(file: nil, line: 1),
                 reason: "Type name should be between 3 and 40 characters in length: 'Ab'")])
-            XCTAssertEqual(violations("\(kind) Abc {}\n"), [])
 
             let longName = join("", Array(count: 40, repeatedValue: "A"))
             XCTAssertEqual(violations("\(kind) \(longName) {}\n"), [])
@@ -80,7 +79,40 @@ class LinterTests: XCTestCase {
     }
 
     func testVariableNames() {
-        // TODO: Variable names should contain between 3 and 20 characters.
+        for kind in ["class", "struct"] {
+            for varType in ["var", "let"] {
+                XCTAssertEqual(violations("\(kind) Abc { \(varType) def: Void }\n"), [])
+
+                XCTAssertEqual(violations("\(kind) Abc { \(varType) de_: Void }\n"), [
+                    StyleViolation(type: .NameFormat,
+                        location: Location(file: nil, line: 1),
+                        reason: "Variable name should only contain alphanumeric characters: 'de_'")
+                    ])
+
+                XCTAssertEqual(violations("\(kind) Abc { \(varType) Def: Void }\n"), [
+                    StyleViolation(type: .NameFormat,
+                        location: Location(file: nil, line: 1),
+                        reason: "Variable name should start with a lowercase character: 'Def'")
+                    ])
+
+                XCTAssertEqual(violations("\(kind) Abc { \(varType) de: Void }\n"), [
+                    StyleViolation(type: .NameFormat,
+                        location: Location(file: nil, line: 1),
+                        reason: "Variable name should be between 3 and 40 characters in length: " +
+                        "'de'")
+                    ])
+
+                let longName = join("", Array(count: 40, repeatedValue: "d"))
+                XCTAssertEqual(violations("\(kind) Abc { \(varType) \(longName): Void }\n"), [])
+                let longerName = longName + "d"
+                XCTAssertEqual(violations("\(kind) Abc { \(varType) \(longerName): Void }\n"), [
+                    StyleViolation(type: .NameFormat,
+                        location: Location(file: nil, line: 1),
+                        reason: "Variable name should be between 3 and 40 characters in length: " +
+                        "'\(longerName)'")
+                    ])
+            }
+        }
     }
 
     func testClosureLengths() {
@@ -207,6 +239,7 @@ class LinterTests: XCTestCase {
 
     func testForceCasting() {
         XCTAssertEqual(violations("NSNumber() as? Int\n"), [])
+        XCTAssertEqual(violations("// NSNumber() as! Int\n"), [])
         XCTAssertEqual(violations("NSNumber() as! Int\n"),
             [StyleViolation(type: .ForceCast,
                 location: Location(file: nil, line: 1),
diff --git a/Source/swiftlint/Lint.swift b/Source/swiftlint/Lint.swift
index 1475e3d6f..ea32a455e 100644
--- a/Source/swiftlint/Lint.swift
+++ b/Source/swiftlint/Lint.swift
@@ -16,7 +16,8 @@ let fileManager = NSFileManager.defaultManager()
 
 struct LintCommand: CommandType {
     let verb = "lint"
-    let function = "Print lint warnings and errors for the Swift files in the current directory (default command)"
+    let function = "Print lint warnings and errors for the Swift files in the current directory " +
+                   "(default command)"
 
     func run(mode: CommandMode) -> Result<(), CommandantError<()>> {
         println("Finding Swift files in current directory...")