Particularly:

a) PBC name as the owner (Polskie Badanie Czytelnictwa),

b) name of the study (PBC General),

c) name of the company which carried out the research (Realisation: Millward Brown SMG/KRC),

d) date of fieldwork

e) name of the readership indicator used,

f ) target group size, marked with the letter n= 

g) comprehensive description (defined through terms and categories of variables used in the PBC survey) of the population studied, i.e. the population from which the sample was selected, especially when terms used in the interpretation vary from the names of the variables used in the survey 

h) name of the author of the study: „prepared by [name of the company]”

The bigger the sample, the more accurate the data. PBC recommends that only samples consisting of no fewer than 100 individuals should be analysed. Results obtained from smaller samples contain too great an error to allow for reasonable conclusions about the whole population. 

Note: 100 respondents may be insufficient if a table contains too many cells at the intersection of rows and columns in analysed categories.

The best way to improve the accuracy of the analysis is to increase the sample size by:
 a) broadening time scale (joint analysis of several waves of research)
 b) setting less strict conditions for a target group. 

The most glaring error is to interpret the difference between different indicators as a change in readership, despite the fact that the difference is within the margin of error with the confidence level of 95%.

PBC recommends checking confidence intervals, i.e. intervals likely to include any given parameter in the population in relation to the result from the sample. Confidence intervals are estimated by the Soft Report Explorer software.

a) have the form of charts, which means that the size of graphic elements is proportional to the actual data

b) if the data are not scaled to zero, numeral or percentage description has to be added and so do the scale used and the value of a variable presented in the chart
c) when charts are presented in close proximity, care must be taken to unambiguously mark and describe the scales used in the charts

1. Press titles in presentations should be identical to the titles used by PBC or to the names presented by ZKDP.

It is particularly unacceptable to use the name of a mutation of regional title as the title of publication in the region. 

2. Users may create Groups of Publications unless such packages are already available;

I. The name should be unambiguously described and presented as a Group of Publications, or marked as collective data. The description must contain information about the titles and publishers included in the group; 

II. The name may not be confusing;

III. The name of a Group of Publications may: 

a. consist of the titles of all the publications included 

b. contain a proper or a common noun or

c. contain the title or a part of a title from the Group if all the publications from the group share this title/ part of the title. 

IV. The name of a Group of Publications MAY NOT contain the title and/or part of the title of any publication form the group and may not be identical to any title form the group, except the situation described in IIIc. 

3. It is unacceptable to present a Group of Publications including titles which, in accordance with point 16 hereof, are considered as separate titles, with an aim to interpret such Group as a one title maintaining the continuity of the Title. 

4. When presenting a Package, users should include the full name of a package identical to the name used in the browser, information about the publications/ reach/ supplements as well as the method of packaging.