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This rating was first developed in 1999 to follow the performance of cricketers in the Limited over match particularly in a closed tournament like the World Cup.

In this rating system, an attempt has been made here to give suitable weightages to different aspects of the game to provide a cross platform comparison.

The critical part of the difference with other ratings is that Naavi Rating is a rating that evaluates the performance in relation to the most relevant parameters. The new system also takes into account the different playing condition when the team performs second, ie chasing or defending a score.

The rating is based on actual performance moderated by

a) Team's Performance if batting or bowling first or the target performance if bowling or batting second

b) The opposition teams strength in batting or bowling

All players will start with a zero base and accumulate points based on their performances. There will be no carryover of reputation from earlier performances. Ponting and Robin Utthappa will therefore have equal chances of being the "Man of World Cup 2007".
 

The rating in 2007 will be based on new weightages given to different teams. Naavi_rating 2007 will be computed in the following  steps.

Step 1.Calculation of Basic Points: 

Points will be awarded based on the runs scored, wickets taken, catches/stumpings/runouts effected.(See points table below).

Step 2.Calculation of Bonus points and adding to Basic Points:

Points will be added to the basic points based on the rate of runs scored(batsmen) and rate of runs given(Bowlers).(See points table below).

Step 3.Determine the Weightage factor:

The total points gained in step 2 will be converted into ratings based on a weightage factor.

The principal of this weightage would be to factor-in the "Difficulty" based on the strength of opposition. The weightage chart given here under is based on a subjective evaluation of strengths of different schemes. This can be converted( Under process) in to a more scientific method by calculating the "Batting Strength" and "Bowling Strength" of each team based on Kumble rating scheme or Price Waterhouse-Cooper rating scheme which has been monitoring the players for some time.

The weightage will be used as a multiplier if the points after step 2 is positive and as a divider if the points at step 2 is negative.

Step 4. Calculate the Rating for the match and add to the previous rating:

    (Basic Points + or – Bonus Points) X or / Weightage 
    factor)

  Bonus Points Chart: a: Batting Bonus:

Bonus= Individual Run rate per ball  ~ Team/Target run Rate per ball X Number of balls faced. (Difference of the rates whether positive or negative multiplied by the number of balls faced will constitute the bonus)

E.g.: If the team has scored 300 runs in 50 overs i.e. 300 balls, the team rate would be 1 per  ball. If Dravid has scored 80 runs in  hundred balls he will have a negative 20 as bonus [(0.8-1.0)X100]. His total points at this stage would be 60 instead of 80. If Dhoni has scored 30 of 20 balls his individual rate would be 1.5 per  ball as against the team's  rate of 1 per ball and his bonus would be 10[(1.5-1.0)X20]. His total points would be 40 inclusive of the bonus. This provides a level playing field for batsmen who would be coming late in the order.

P.S. team Score will be inclusive of extras. 
 

When a team is chasing, the "Target Rate" will be the basis for calculation of difference and not the team score.

Eg: If the target is 250, the target run rate is 5 per 6 balls. The team may actually score at run a ball. A batsman scores 50 in 60 balls. Then there will be no deduction for the scoring rate being below the team rate.
 

B: Bowling bonus:

 

Bonus= (Team/Target Run given rate per over~Individual run given rate per over)X Number of overs bowled by the bowler (Bonus will be positive if the bowler has given less runs than the team and negative if he has given more runs than the team. It will also get multiplied by the number of overs bowled)

E.g.; If Agarkar has bowled 10 overs and given 30 runs, his rate would be 3.0 per over. If the team has given 5.0 runs per over, Agarkar will get a positive bonus of 20 points (equivalent to getting a wicket).

If Munaf has given 30 runs in 5 overs in the same match he will get a negative bonus of 5 points [ (6.0-5.0)X5].

P.S.: Team Score will be inclusive of extras. Bowler runs given will include wides and or No balls as per the rules adopted in the ODI official rules.

When the team is defending a score, the target rate will be the basis for calculation of the difference and not the team rate.

Eg: A Bowler bowling in defense of a score of 249.

Target is 250 or 5 per over.

Zaheer Khan bowls 10 overs and gives away 40 runs taking 3 wickets.

His basic points will be 75.

Run rate difference is 1. Bonus for 10 overs is 10.

His total points would be 85 which will be further multiplied by the opposing team's difficulty weightage.

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  3. Weightage Chart:

Points at step 2  if positive will be multiplied by the weightage factor to arrive at the rating.

Points at step 2  if negative will be divided by the weightage factor to arrive at the rating. 
 

The weightage table is as follows:

	Playing Vs  Team	Batting Point Weightage (multiplier for the bowling of opposition)	Bowling Point Weightage (multiplier for the batting of opposition)
1	Australia	1.3	1.2
2	South Africa	1.1	1.2
3	New Zealand	1.0	1.1
4	Sri Lanka	1.0	1.1
5	India	1.0	1.0
6	West Indies	0.9	1.0
7	England	0.9	0.9
8	Pakistan	0.9	0.9
9	Bangladesh	0.6	0.7
10	Zimbabwe	0.5	0.5
11	Kenya	0.4	0.4
12	Scotland	0.4	0.4
13	Netherlands	0.4	0.4
14	Canada	0.4	0.4
15	Ireland	0.4	0.4
16	Bermuda	0.4	0.4

* There will  be no weightage for fielding points.

(The weightage table has been revised based on the performances of players in the build up to the world cup)