diff --git a/src/Ballot.sol b/src/Ballot.sol
index 72fcd4840a410a5b7dd5d8b8ac1124c206ec5aac..a451841f6f40dddcf13d4b056f46a22d45170103 100644
--- a/src/Ballot.sol
+++ b/src/Ballot.sol
@@ -20,8 +20,8 @@ contract            Ballot      {
     struct          Votingrules  {
         string      title;
         address     chairman;
-        uint        voteAtOrAfter;
-        uint        voteAtOrBefore;
+        uint        voteStarts;
+        uint        voteBefore;
         // A NOTE ON PERCENTAGES
         // At present floats do not exist. Since we merely use
         // our floats to later present to the outside world,
@@ -60,8 +60,8 @@ contract            Ballot      {
     /// Create a new ballot to choose one of `proposalNames`.
     constructor(
         string      ballotTitle,
-        uint        voteAtOrAfter,
-        uint        voteAtOrBefore,
+        uint        voteStarts,
+        uint        voteBefore,
         uint        percentOfRegisteredVotersReqToBeValid,
         uint        percentOfVotesCastToWin,
         bool        countNonvotesAsBlanks,
@@ -69,13 +69,15 @@ contract            Ballot      {
     )
         public
     {
-        require( voteAtOrBefore > now );
+        require( voteBefore > now );
+        require( percentOfRegisteredVotersReqToBeValid <= 100000000 );
+        require( percentOfVotesCastToWin               <= 100000000 );
         // chairman can not automatically vote. Chairman must
         // giveRightToVote to himself if he wants to vote.
         rules.chairman                                  =   msg.sender;
         rules.title                                     =   ballotTitle;
-        rules.voteAtOrAfter                             =   voteAtOrAfter;
-        rules.voteAtOrBefore                            =   voteAtOrBefore;
+        rules.voteStarts                                =   voteStarts;
+        rules.voteBefore                                =   voteBefore;
         rules.percentOfRegisteredVotersReqToBeValid     =   percentOfRegisteredVotersReqToBeValid;
         rules.percentOfVotesCastToWin                   =   percentOfVotesCastToWin;
         rules.countNonvotesAsBlanks                     =   countNonvotesAsBlanks;
@@ -104,8 +106,8 @@ contract            Ballot      {
         public
     {
         // May only be called by chairman.
-        require( msg.sender == rules.chairman );
-        require( rules.voteAtOrBefore <= now  );
+        require( msg.sender == rules.chairman   );
+        require( rules.voteBefore < now         );
         uint        idx                     =   voterMap[voter];
         // Can't add voters more than once.
         require( idx == 0 );
@@ -145,8 +147,8 @@ contract            Ballot      {
         public
     {
         require( proposal < numproposals        );
-        require( rules.voteAtOrAfter  >= now    );
-        require( rules.voteAtOrBefore <= now    );
+        require( rules.voteStarts  >= now       );
+        require( rules.voteBefore < now         );
         int         idx                     =   getVoterIdx( msg.sender );
         require( idx > -1 );
         uint        uidx                    =   uint( idx );