(c) Quality of data; whether the data are collected by adequate means, are consistent with each other, complete and otherwise reliable; (d) Validity of indicator; whether the indicator measures what it is intended to measure. This involves both statistical validity and conceptual validity. (Thus an indicator such as the relative number of hospital beds in a country may be a statistically valid measure of hospital facilities but its use as a measure of the national health level may not be valid); (e) Discriminative power: whether the indicator effectively distinguishes between countries at different levels of development, particularly between developing countries at different levels, and is meaningfully related to (correlated with) other indicators of development within and without the sector in question; (f) Balance and avoidance of duplication: whether the indicator contributes to sectoral balance or to imbalance or duplication in the set of indicators ; (g) Conceptual significance: whether the indicator, if valid, indicates a conceptually significant aspect or element of development rather than an accidental or unimportant aspect. 7/ 15. WHO has also developed certain criteria for indicator selection, stating that "ideal indicators should be: (a) Valid - that is, they should actually measure what they are supposed to measure; (b) Objective - the answer should be the same if measured by different people in similar circumstances; (c) Sensitive - that is, they should be sensitive to the changes in the situation; and (d) Specific - that is, they should reflect changes only in the situation concerned". 16. It has also been stated that "in real life there are very few indicators that comply with all these criteria. Their scientific respectability therefore has to be tempered with a certain humility ... . They are indirect or partial measures of a complex situation, but if measured sequentially over 
**Analysis**
This text discusses the selection of indicators for measuring development, focusing on criteria such as validity, reliability, and sensitivity. The indicators are used to assess the situation, and the text highlights the importance of considering various aspects, including the conceptual significance of the indicator. This suggests that the category is likely related to development or social sciences.

**Category**
Health, Education