Major issues in the conflict:
i)Conflict within an individual: John is suffering from his own value and goals related conflicts. He is not able to play the role assigned to him in an organization as they do not confirm with his own values and beliefs (Einarsen, 2010).
ii)Working styles conflict: John and Tania have different working styles though both are dependent on each other for performing their duties. Each individual has its own style of working with own needs and personality (Afzalur Rahim, 2001). Thus John did not find e reports prepared by Tania worth for including in his work.
iii)Poor communication: When both Tania and John were in conflicting situation only informal steps were taken for resolving them but no formal step was taken so that it would have been binding on both of them to follow.
iv)Competition: John was having personal competitive conflict with Tania that was even unhealthy. The competition between the two was not managed properly that resulted in John insulting Tania and Tania reacting towards it due to which a hostile working environment was created in the organization. It discouraged teamwork and promoted individualism in the organization (Dipboye, 2013).
The other causes of conflict between John and Tania include power imbalances, gender biasness and high emotional disability etc. emotional instability can also be judged with an instance from the case that Wolfgang told me that John was referring a doctor for work related problems and may consider leaves due to excessive workplace stress.