"The concept of political congruence is introduced as predictor or explanatory factor of trade union renewal. Strategic change is more likely to succeed when political congruence exists between the values, expectations and intended outcomes of the three sub-sets of leaders, activists and members in a union. Political congruence (P/c) is defined as convergence of shared political values and vision. For P/c to occur a particular chemistry of independent factors needs to coalesce. The authors note, in particular, that there have been exceptional periods of individual union growth, measured in terms of membership, density and effectiveness. These episodes of exceptional growth need to be studied and understood, if one is to make sense of debates on union ‘renewal'."

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