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Annex II.2 Methods for calculating the anomaly threshold for the automatic exclusion of offers.

(Article 54, paragraph 2)

 

The contracting authorities shall identify, pursuant to Article 54, paragraph 2 of the code, one of the methods, described below, for calculating the anomaly threshold, for the purposes of automatic exclusion of offers, in the case of awarding works or construction contracts with the lowest price criterion services.

 

METHOD A

1) When the number of offers admitted is equal to or greater than fifteen, the adequacy of the offers is assessed on the offers that present a reduction equal to or greater than a specific anomaly threshold; in order not to make the reference parameters for the calculation of the anomaly threshold predeterminable by the bidders, the RUP or the judging commission proceed as follows:

a) calculation of the sum and arithmetic mean of the percentage reductions of all accepted offers, with the exclusion of 10 per cent, rounded to the nearest whole number, respectively for the offers with the highest reduction and those with the lowest reduction; offers having an equal discount value are taken into consideration separately in their individual values; if, when carrying out the calculation of the 10 percent, there are one or more offers of equal value compared to the offers to be set aside, said offers must also be set aside;

b) calculation of the arithmetic average deviation of the reductions percentages that exceed the average calculated pursuant to letter a), excluding those set aside pursuant to letter a);

c) calculation of the threshold as the sum of the arithmetic mean and the arithmetic average deviation of the reductions referred to in letter b);

d) the threshold calculated in letter c) is decreased by a percentage value, equal to the product of the first two digits after the decimal point of the sum of the reductions referred to in letter a), applied to the arithmetic mean deviation referred to in letter b).

2) When the number of admitted offers is less than fifteen, the adequacy of the offers is assessed on the offers that present a reduction equal to or greater than an anomaly threshold determined; for the purposes of determining the adequacy of the offers, in order not to make the reference parameters for the calculation of the anomaly threshold pre-determinable by the bidders, the RUP or the judging commission proceeds as follows:

a) calculation of the arithmetic average of the percentage reductions of all the admitted offers, with the exclusion of 10 percent, rounded to the nearest whole number, respectively of the offers with the greatest reduction and those with the lowest reduction; offers having an equal discount value are taken into consideration separately in their individual values; if, when carrying out the calculation of the 10 percent, there are one or more offers of equal value compared to the offers to be set aside, said offers must also be set aside;

b) calculation of the arithmetic average deviation of the reductions percentages that exceed the average calculated pursuant to letter a), excluding those set aside referred to in letter a);

c) calculation of the ratio between the arithmetic mean deviation referred to in letter b) and the arithmetic mean referred to in letter a);

d) if the ratio referred to in letter c) is equal to or less than zero point fifteen, the anomaly threshold is equal to the value of the arithmetic mean referred to in letter a); ) increased by 20 percent of the same arithmetic mean);

e) if the ratio referred to in letter c) is greater than zero point fifteen, the anomaly threshold is calculated as the sum of the arithmetic mean of which in letter a) and the arithmetic mean deviation referred to in letter b).

3) All discounts above the anomaly threshold are automatically excluded. Among the offers not excluded, the contracting authority identifies the one with the greatest discount as the winner. The award discount paid to the winning company is the one that this same company presented. In case of a tie between the lowest offers, the winner is decided by a draw.

 

< b>METHOD B

1) The anomaly threshold is determined as follows:

a) calculation of the sum and arithmetic mean of the percentage reductions of all admitted offers , with the exclusion of 10 percent, rounded to the nearest whole number, of the lowest and lowest bids respectively; offers having an equal discount value are taken into consideration separately in their individual values; if, when carrying out the calculation of the 10 percent, there are one or more offers of equal value compared to the offers to be set aside, said offers must also be set aside;

b) calculation of the arithmetic average deviation of the reductions percentages that exceed the average calculated pursuant to letter a), excluding those set aside pursuant to letter a);

c) calculation of the threshold as the sum of the arithmetic mean and the arithmetic average deviation of the reductions referred to in letter b);

d) calculation of a percentage value equal to the product of the first two digits after the decimal point of the sum of the reductions referred to in letter a) applied to the arithmetic mean deviation referred to in letter b);

e) calculation of the sum of all the digits, both before and after the decimal point up to the second decimal, of the sum of the reductions referred to in letter a);

f) the anomaly threshold is equal to the threshold referred to in letter c):

1. decreased by the value referred to in letter d), in the event that the value referred to in letter e) is equal;

2. increased by the value referred to in letter d), in the event that the value referred to in letter e) is odd.

2) All discounts equal to or lower than the anomaly threshold referred to in point 1) , including those set aside in the calculation referred to in point 1), letter a), are "non-anomalous" offers. Among all the "non-anomalous" offers, the contracting authority identifies the company that offered the greatest discount as the winner. The award discount paid to this winning company is equal to the highest discount among all those admitted and excluding that of the winning company (so-called "second price method"). In the event of a tie with multiple offers identical to the highest discount, the winner is drawn at random from among these offers and the award discount recognized is equal to the discount offered by the winning bidder.

Description of the winning method "second price": once the offers have been received, expressed as a discount compared to the starting price, the contracting authority proceeds to calculate the anomaly threshold as indicated in point 1) and excludes all offers that present discounts higher than this threshold. Afterwards, for the offers identified as "non-anomalous", the contracting authority orders the related discounts from highest to lowest as s1 > s2 >…> sN: the company with a discount equal to s1 wins and the contract award discount is equal to s2. In the case of a tie between two (or more) highest discounts (i.e. if s1 = s2), then the winning company is drawn among all those that have offered the highest discount and the award discount is equal to the discount offered by this same company.

 

METHOD C

1) The application of this method requires that, preliminarily, the contracting authority has indicated in the tender notice or in the invitation to participate the reference discount which represents, indicatively, the anomaly threshold net of a dependent random component from the discounts received. This discount is expressed as a percentage of the auction base with respect to which the companies formulate their discounts and is identified either among the values reported in Table A or by deviating from these and motivating the choice based on the need to select an offer with price-quality characteristics consistent with the needs of the contracting authority itself. In this second case, the contracting authority applies verifiable criteria to determine the reference discount, comparing the benefits of larger discounts with the costs of selecting a winning bid with potentially lower quality.

2) The anomaly threshold is determined as follows:

a) calculation of the sum and arithmetic mean of the percentage reductions of all admitted offers, with the exclusion of 10 percent, rounded to the nearest whole number of the lowest and lowest bids respectively; offers having an equal discount value are taken into consideration separately in their individual values; if, when carrying out the calculation of the 10 percent, there are one or more offers of equal value compared to the offers to be set aside, said offers must also be set aside;

b) calculation of the arithmetic average deviation of the reductions percentages that exceed the average calculated pursuant to letter a), excluding those set aside referred to in letter a);

c) calculation of a percentage value equal to the product of the first two digits after the decimal point of the sum of reductions referred to in letter a) applied to the arithmetic mean deviation referred to in letter b);

d) calculation of the sum of all the digits, both before and after the decimal point up to the second decimal, of the sum of the discounts referred to in letter a) ;

e) the anomaly threshold is equal to the reference discount referred to in point 1):

1. decreased by the value referred to in letter c), in the event that the value referred to in letter d) is equal;

2. increased by the value referred to in letter c), in the event that the value referred to in letter d) is odd.

3) All discounts above the threshold referred to in letter e) of point 2) are automatically excluded. Among the offers not excluded, including those initially set aside for the calculation referred to in letter a), the contracting authority identifies the one with the greatest discount as the winner. The award discount paid to the winning company is the one that this same company presented. In the event of a tie between the lowest bids, the winner is decided by a draw. If all the offers presented are anomalous, the contracting authority evaluates the actual anomaly in consultation.

 

TABLE A< /p>

< /tr> < /tr> < td width="10%" nowrap="" valign="bottom">

30,511

< tr> < td width="10%" nowrap="" valign="bottom">

41,779

< td width="10%" nowrap="" valign="bottom">

52,800

< td width="10%" nowrap="" valign="bottom">

50,570

< p align="center">Type of work (category and size class)

Distribution of award discounts (in %)

50° pct

60° pct

70° pct

< b>80° pct

90° pct< /b>

95° pct

99° pct

OG1

Job size

<150k

23,791

26,690

29,055

 < p align="right">32,000

36,380

40,020

50,130

150k-1mln

25,531

27,850

29,950

32,550

36,574

40,103

52,000

1mln-EU

22,320

25,353

27,531

29,056

32,853

40,000

55,216

OG2

Job size

< ;150k

23,946

26,176

28,560

31,183

36,010

40,000

50,525

150k-1mln

24,666

26,810

28,380

34,544

38,380

51,030

1mln-EU

23,348

25,371

28,120

32,292

36,070

< /td>

40,334

47,999

OG3

Job size

< /td>

<150k

19,775

23,000

26,120

29,991

34,484

38,200

45,580

150k-1mln

21,880

24,793

27,923

31,923

35,473

39,722

47,100

1mln-EU

25,956

< /td>

28,377

30,420

33,664

40,000

42,425

56,990

OG6< /p>

< p>

Job size

<150k

20,120

24,060

27,850

31,550

35,999

38,921

49,990

150k-1mln

21,365

24,302

26,929

31,100

34,222

37,590

41,779

1mln-EU (*)

21,365

24,302

26,929

31,100

34,222

37,590

OG7

< /p>

Job size

<150k

16,172

20,116

 < p align="right">23,554

28,160

33,824

37,410

52,250

150k-1mln

20,064

22,757

25,090

30,011

34,625

42,110

52,800

1mln-EU (*)

20,064

22,757

25,090

30,011

34,625

42,110

OG8

< /p>

Job size

<150k

18,510

21,791

 < p align="right">25,610

30,635

36,000

39,800

48,970

150k-1mln

19,135

22,064

25,555

29,560

35,000

39,435

50,570

1mln-EU (*)

19,135

22,064

25,555

29,560

35,000

39,435

OG9

< /p>

Job size

<150k

24,673

27,379

 < p align="right">31,000

36,448

49,160

50,000

75,260

150k-1mln

26,400

29,998

33,270

35,200

39,000

43,770

54,500

1mln-EU (*)

26,400

29,998

33,270

35,200

39,000

43,770

54,500

OG10

< p>

Job size

<150k

26,258

30,270

32,498

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