The natural of W-E bonding in group 14 compounds [(CO)4W-{NHE)] (W4-NHE) has been investigated by means of the Energy Decomposition Analysis-Natural Orbital for Chemical Valence (EDA-NOCV) method which combines charge (NOCV) and energy (EDA) partitioning schemes at the BP86/TZ2P+ level of theory. The EDA-NOCV results indicate that the decrease in bond strength from W4-NHC to W4-NHPb correlates with the decrease of deltaEelstat and deltaEorb and the trend of the W-E bond strength was W4-NHC W4-NHSi W4-NHGe W4-NHSn W4-NHPb. The decrease in the donation (CO)4W NHE, which is manifested in the calculated values for deltaEo and in the electrostatic attraction, deltaEelstat , provides a rationale for the weaker bonding of the heavier atoms E. The bonding in the complexes with N-heterocyclic carbene and analogues W4-NHE exhibits the typical feature in terms of strong a-donation and weak ndonation. All investigated complexes [(CO)4W-{NHE}] are suitable targets for synthesis which will open the door to a new field of experimental chemistry.